# # This file is used for Rink, a unit # conversion program inspired by GNU units. # # This file was forked from the GNU Units database in 2016. The original # description of the file is listed below. # # A summary of changes from the original: # - Removing features not used by Rink # such as support for non-UTF8 encodings. # - Adding a concept of "substances" unique to Rink. # - Adding some syntax such as doc comments. # - Adopted "New SI" (26th CGPM, 2018). # ############################################################################ # # This file is the units database for use with GNU units, a units conversion # program by Adrian Mariano adrianm@gnu.org # # August 2015 Version 2.13 # # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006 # 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 # Free Software Foundation, Inc # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, # Boston, MA 02110-1301 USA # ############################################################################ # # Improvements and corrections are welcome. # # Fundamental constants in this file are the 2014 CODATA recommended values. # # Most units data was drawn from # 1. NIST Special Publication 811, Guide for the # Use of the International System of Units (SI). # Barry N. Taylor. 1995 # 2. CRC Handbook of Chemistry and Physics 70th edition # 3. Oxford English Dictionary # 4. Websters New Universal Unabridged Dictionary # 5. Units of Measure by Stephen Dresner # 6. A Dictionary of English Weights and Measures by Ronald Zupko # 7. British Weights and Measures by Ronald Zupko # 8. Realm of Measure by Isaac Asimov # 9. United States standards of weights and measures, their # creation and creators by Arthur H. Frazier. # 10. French weights and measures before the Revolution: a # dictionary of provincial and local units by Ronald Zupko # 11. Weights and Measures: their ancient origins and their # development in Great Britain up to AD 1855 by FG Skinner # 12. The World of Measurements by H. Arthur Klein # 13. For Good Measure by William Johnstone # 14. NTC's Encyclopedia of International Weights and Measures # by William Johnstone # 15. Sizes by John Lord # 16. Sizesaurus by Stephen Strauss # 17. CODATA Recommended Values of Physical Constants available at # http://physics.nist.gov/cuu/Constants/index.html # 18. How Many? A Dictionary of Units of Measurement. Available at # http://www.unc.edu/~rowlett/units/index.html # 19. Numericana. http://www.numericana.com # 20. UK history of measurement # http://www.ukmetrication.com/history.htm # 21. NIST Handbook 44, Specifications, Tolerances, and # Other Technical Requirements for Weighing and Measuring # Devices. 2011 # 22. NIST Special Publication 447, Weights and Measures Standards # of the the United States: a brief history. Lewis V. Judson. # 1963; rev. 1976 # # Thanks to Jeff Conrad for assistance in ferreting out unit definitions. # ########################################################################### # # If units you use are missing or defined incorrectly, please contact me. # If your country's local units are missing and you are willing to supply # them, please send me a list. # # I added shoe size information but I'm not convinced that it's correct. # If you know anything about shoe sizes please contact me. # ########################################################################### ########################################################################### # # Brief Philosophy of this file # # Most unit definitions are made in terms of integers or simple fractions of # other definitions. The typical exceptions are when converting between two # different unit systems, or the values of measured physical constants. In # this file definitions are given in the most natural and revealing way in # terms of integer factors. # # If you make changes be sure to run 'units --check' to check your work. # # The file is USA-centric, but there is some modest effort to support other # countries. This file is now coded in UTF-8. To support environments where # UTF-8 is not available, definitions that require this character set are # wrapped in !utf8 directives. # # When a unit name is used in different countries with the different meanings # the system should be as follows: # # Suppose countries ABC and XYZ both use the "foo". Then globally define # # ABCfoo # XYZfoo # # Then, using the !locale directive, define the "foo" appropriately for each of # the two countries with a definition like # # !locale ABC # foo ABCfoo # !endlocale # ########################################################################### ########################################################################### # # # Primitive units. Any unit defined to contain a '!' character is a # # primitive unit which will not be reduced any further. All units should # # reduce to primitive units. # # # ########################################################################### !category base_units "SI Base Units" # # SI units # ?? The kilogram, symbol kg, is the SI unit of mass. It is defined by ?? taking the fixed numerical value of the Planck constant h to be ?? 6.626 070 15 × 10^–34 when expressed in the unit J s, which is equal ?? to kg m^2 s^–1, where the metre and the second are defined in terms ?? of c and Δν_Cs. 26th CGPM (2018, CR; 211) kg !kilogram ?? The second, symbol s, is the SI unit of time. It is defined by ?? taking the fixed numerical value of the caesium frequency Δν_Cs, ?? the unperturbed ground-state hyperfine transition frequency of the ?? caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, ?? which is equal to s^–1. 26th CGPM (2018, CR; 211) s !second ?? The metre, symbol m, is the SI unit of length. It is defined by ?? taking the fixed numerical value of the speed of light in vacuum c ?? to be 299 792 458 when expressed in the unit m/s, where the second ?? is defined in terms of Δν_Cs. 26th CGPM (2018, CR; 211) m !meter ?? The ampere, symbol A, is the SI unit of electric current. It is ?? defined by taking the fixed numerical value of the elementary charge ?? e to be 1.602 176 634 × 10^–19 when expressed in the unit C, which ?? is equal to A s, where the second is defined in terms of Δν_Cs. ?? 26th CGPM (2018, CR; 211) A !ampere amp A ?? The candela, symbol cd, is the SI unit of luminous intensity in a ?? given direction. It is defined by taking the fixed numerical value ?? of the luminous efficacy of monochromatic radiation of frequency ?? 540 × 10^12 Hz, Kcd, to be 683 when expressed in the unit lm W^–1, ?? which is equal to cd sr W^–1, or cd sr kg^–1 m^–2 s^3, where the ?? kilogram, metre and second are defined in terms of h, c and Δν_Cs. ?? 26th CGPM (2018, CR; 211) cd !candela ?? The mole, symbol mol, is the SI unit of amount of substance. One ?? mole contains exactly 6.022 140 76 × 10^23 elementary entities. ?? This number is the fixed numerical value of the Avogadro constant, ?? N_A, when expressed in the unit mol^–1 and is called the Avogadro ?? number. ?? ?? The amount of substance, symbol n, of a system is a measure of the ?? number of specified elementary entities. An elementary entity may ?? be an atom, a molecule, an ion, an electron, any other particle ?? or specified group of particles. ?? 26th CGPM (2018, CR; 211) mol !mole ?? The kelvin, symbol K, is the SI unit of thermodynamic temperature. ?? It is defined by taking the fixed numerical value of the Boltzmann ?? constant k to be 1.380 649 × 10^–23 when expressed in the unit ?? J K^–1, which is equal to kg m^2 s^–2 K^–1, where the kilogram, ?? metre and second are defined in terms of h, c and Δν_Cs. ?? 26th CGPM (2018, CR; 211) K !kelvin !endcategory !category base_nonsi "Non-SI Base Units" # # The radian and steradian are defined as dimensionless primitive units. # The radian is equal to m/m and the steradian to m^2/m^2 so these units are # dimensionless. Retaining them as named units is useful because it allows # clarity in expressions and makes the meaning of unit definitions more clear. # These units will reduce to 1 in conversions but not for sums of units or for # arguments to functions. # ?? The angle subtended at the center of a circle by an arc equal in ?? length to the radius of the circle radian ! ?? Solid angle which cuts off an area of the surface of the sphere ?? equal to that of a square with sides of length equal to the radius ?? of the sphere sr !steradian # # Some primitive non-SI units # ?? Basic unit of information (entropy). The entropy in bits of a ?? random variable over a finite alphabet is defined to be the sum of ?? -p(i)*log2(p(i)) over the alphabet where p(i) is the probability ?? that the random variable takes on the value i. bit ! ?? One international unit of a biological agent is the biological ?? activity equivalent to a standard amount of a substance that ?? represents the agent (its “reference preparation”). Agents that ?? can be measured in international units are generally found in ?? multiple forms (such as Vitamin A) and/or not meaningfully ?? comparable in SI units like moles (such as prolactin). ?? WHO TRS 932, Annex 2. IU ! !endcategory ########################################################################### # # # Prefixes and Number Systems # # # ########################################################################### !category prefixes "Prefixes" # # SI prefixes. These are standardized through CGPM resolutions. # The set has been expanded over time. # - 1795: milli through kilo # - 1873: mega and micro # - 1960: giga, tera, nano, and pico # - 1964: femto, atto # - 1975: peta, exa # - 1991: zetta, yotta, zepto, and yocto # - 2022: ronna, quetta, ronto, quecto # quetta- 1e30 # Latin decem, "ten" ronna- 1e27 # Greek ennéa, "nine" yotta- 1e24 # Greek or Latin octo, "eight" zetta- 1e21 # Latin septem, "seven" exa- 1e18 # Greek hex, "six" peta- 1e15 # Greek pente, "five" tera- 1e12 # Greek teras, "monster" giga- 1e9 # Greek gigas, "giant" mega- 1e6 # Greek megas, "large" myria- 1e4 # Not an official SI prefix kilo- 1e3 # Greek chilioi, "thousand" hecto- 1e2 # Greek hekaton, "hundred" deca- 1e1 # Greek deka, "ten" deka- deca deci- 1e-1 # Latin decimus, "tenth" centi- 1e-2 # Latin centum, "hundred" milli- 1e-3 # Latin mille, "thousand" micro- 1e-6 # Latin micro or Greek mikros, "small" nano- 1e-9 # Latin nanus or Greek nanos, "dwarf" pico- 1e-12 # Spanish pico, "a bit" femto- 1e-15 # Danish-Norwegian femten, "fifteen" atto- 1e-18 # Danish-Norwegian atten, "eighteen" zepto- 1e-21 # Latin septem, "seven" yocto- 1e-24 # Greek or Latin octo, "eight" ronto- 1e-27 # Greek ennéa, "nine" quecto- 1e-30 # Latin decem, "ten" Q-- quetta R-- ronna Y-- yotta Z-- zetta E-- exa P-- peta T-- tera G-- giga M-- mega k-- kilo h-- hecto da-- deka d-- deci c-- centi m-- milli u-- micro # it should be a mu but u is easy to type n-- nano p-- pico f-- femto a-- atto z-- zepto y-- yocto r-- ronto q-- quecto # # Binary prefixes # kibi- 2^10 # In response to the convention of illegally mebi- 2^20 # and confusingly using metric prefixes for gibi- 2^30 # powers of two, the International tebi- 2^40 # Electrotechnical Commission aproved these pebi- 2^50 # binary prefixes for use in 1998. If you exbi- 2^60 # want to refer to "megabytes" using the zebi- 2^70 # binary definition, use these prefixes. yobi- 2^80 # Ki-- kibi # In 1999, an ammendment was published Mi-- mebi # that added pebi- and exbi-. The third Gi-- gibi # edition of the standard in 2005 added Ti-- tebi # zebi- and yobi-. Pi-- pebi Ei-- exbi Zi-- zebi Yi-- yobi # Common fractions quarter-- 1|4 semi-- 0.5 demi-- 0.5 hemi-- 0.5 half- 0.5 double- 2 triple- 3 treble- 3 !endcategory !category numbers "Numbers" # # Names of some numbers # one 1 two 2 double 2 couple 2 three 3 triple 3 four 4 quadruple 4 five 5 quintuple 5 six 6 seven 7 eight 8 nine 9 ten 10 eleven 11 twelve 12 thirteen 13 fourteen 14 fifteen 15 sixteen 16 seventeen 17 eighteen 18 nineteen 19 twenty 20 thirty 30 forty 40 fifty 50 sixty 60 seventy 70 eighty 80 ninety 90 hundred 100 thousand 1000 million 1e6 centillion 1e303 googol 1e100 # googolplex 10^googol # familiar large number equal to 10^googol. # These numbers give overflows. !endcategory !category short_system "Short System" # These number terms were described by N. Chuquet and De la Roche in the 16th # century as being successive powers of a million. These definitions are still # used in most European countries. The current US definitions for these # numbers arose in the 17th century and don't make nearly as much sense. These # numbers are listed in the CRC Concise Encyclopedia of Mathematics by Eric # W. Weisstein. shortbillion 1e9 shorttrillion 1e12 shortquadrillion 1e15 shortquintillion 1e18 shortsextillion 1e21 shortseptillion 1e24 shortoctillion 1e27 shortnonillion 1e30 shortnoventillion shortnonillion shortdecillion 1e33 shortundecillion 1e36 shortduodecillion 1e39 shorttredecillion 1e42 shortquattuordecillion 1e45 shortquindecillion 1e48 shortsexdecillion 1e51 shortseptendecillion 1e54 shortoctodecillion 1e57 shortnovemdecillion 1e60 shortvigintillion 1e63 # # The short system prevails in English speaking countries # billion shortbillion trillion shorttrillion quadrillion shortquadrillion quintillion shortquintillion sextillion shortsextillion septillion shortseptillion octillion shortoctillion nonillion shortnonillion noventillion shortnoventillion decillion shortdecillion undecillion shortundecillion duodecillion shortduodecillion tredecillion shorttredecillion quattuordecillion shortquattuordecillion quindecillion shortquindecillion sexdecillion shortsexdecillion septendecillion shortseptendecillion octodecillion shortoctodecillion novemdecillion shortnovemdecillion vigintillion shortvigintillion !endcategory !category long_system "Long System" longbillion million^2 longtrillion million^3 longquadrillion million^4 longquintillion million^5 longsextillion million^6 longseptillion million^7 longoctillion million^8 longnonillion million^9 longnoventillion longnonillion longdecillion million^10 longundecillion million^11 longduodecillion million^12 longtredecillion million^13 longquattuordecillion million^14 longquindecillion million^15 longsexdecillion million^16 longseptdecillion million^17 longoctodecillion million^18 longnovemdecillion million^19 longvigintillion million^20 longcentillion million^100 # These numbers fill the gaps left by the long system above. milliard 1000 million billiard 1000 million^2 trilliard 1000 million^3 quadrilliard 1000 million^4 quintilliard 1000 million^5 sextilliard 1000 million^6 septilliard 1000 million^7 octilliard 1000 million^8 nonilliard 1000 million^9 noventilliard nonilliard decilliard 1000 million^10 # For consistency longmilliard milliard longbilliard billiard longtrilliard trilliard longquadrilliard quadrilliard longquintilliard quintilliard longsextilliard sextilliard longseptilliard septilliard longoctilliard octilliard longnonilliard nonilliard longnoventilliard noventilliard longdecilliard decilliard !endcategory !category indian_numbers "Indian Numbering System" # # Numbers used in India # lakh 1e5 crore 1e7 arab 1e9 kharab 1e11 neel 1e13 padm 1e15 shankh 1e17 !endcategory ########################################################################### # # # Derived units which can be reduced to the primitive units # # # ########################################################################### !category si_derived "SI Derived Units" # # Named SI derived units (officially accepted by the BIPM) # See also: # # SI Brochure # #radian m/m # plane angle (see base_units) #steradian m^2/m^2 # solid angle ?? SI derived unit for frequency. hertz /s # frequency ?? SI derived unit for force. newton kg m / s^2 # force ?? SI derived unit for pressure or stress. pascal N/m^2 # pressure or stress ?? SI derived unit for energy, work, or heat. joule N m # energy ?? SI derived unit for power or radiant flux. watt J/s # power ?? SI derived unit for charge. coulomb A s # charge ?? SI derived unit for electrical potential difference. volt W/A # potential difference ?? SI derived unit for electrical capacitance. farad C/V # capacitance ?? SI derived unit for electrical resistance. ohm V/A # electrical resistance ?? SI derived unit for electrical conductance. siemens A/V # electrical conductance ?? SI derived unit for magnetic flux. weber V s # magnetic flux ?? SI derived unit for magnetic induction or magnetic flux density. tesla Wb/m^2 # magnetic flux density ?? SI derived unit for electrical inductance. henry Wb/A # inductance #degC K # temperature (hardcoded in Rink) ?? SI derived unit for luminous flux. lumen cd sr # luminous flux ?? SI derived unit for illuminance. lux lm/m^2 # illuminance ?? SI derived unit for radioactivity (particle decays per unit time). becquerel /s # radioactivity ?? SI derived unit for absorbed dose of ionizing radiation. gray J/kg # absorbed dose ?? SI derived unit for equivalent dose of ionizing radiation. sievert J/kg # equivalent dose ?? SI derived unit for catalytic activity. katal mol/sec # catalytic activity #rad radian #sr steradian Hz hertz N newton Pa pascal J joule W watt C coulomb V volt F farad Ω ohm S siemens Wb weber T tesla H henry #°C celsius lm lumen lx lux Bq becquerel Gy gray Sv sievert kat katal !endcategory !category si_quantities "SI quantities" # # Quantities that are listed in the SI Brochure, 9th edition. # # Base quantities time ? s length ? m mass ? kg current ? A # electric current temperature ? K # thermodynamic temperature amount ? mol # amount of substance luminous_intensity ? cd # Expressed in terms of base quantities area ? length^2 volume ? length^3 velocity ? length / time acceleration ? velocity / time #wavenumber ? length^-1 # not generic enough density ? mass / volume # density, mass density area_density ? mass / area # area density specific_volume ? volume / mass current_density ? current / area magnetization ? current / length # magnetic field strength molar_concentration ? amount / volume # amount of substance concentration #mass_concentration ? mass / volume # conflict with density luminance ? luminous_intensity / area # Derived quantities angle ? radian # plane angle solid_angle ? sr frequency ? time^-1 force ? acceleration mass pressure ? force / area #stress ? force / area # conflicts with pressure energy ? force length # energy, work, amount of heat power ? energy / time # power, radiant flux charge ? A s # electric charge electrical_potential ? power / current # electric potential difference, # voltage, electric tension capacitance ? charge / electrical_potential resistance ? electrical_potential / current conductance ? resistance^-1 magnetic_flux ? electrical_potential time magnetic_flux_density ? magnetic_flux / area inductance ? magnetic_flux / current #celsius_temperature # celsius isn't a base unit in Rink luminous_flux ? luminous_intensity solid_angle illuminance ? luminous_flux / area #radioactivity ? time^-1 # conflicts with frequency #absorbed_dose ? energy / mass # conflicts with specific_energy #equivalent_dose ? energy / mass # conflicts with specific_energy catalytic_activity ? amount / time # Expressed in terms of derived quantities viscosity ? pressure time # dynamic viscosity #force_moment ? force length # conflicts with energy surface_tension ? energy / area angular_velocity ? angle / time # also angular frequency angular_acceleration ? angle / time^2 heat_flux_density ? power / area # also irradiance entropy ? energy / temperature # heat capacity specific_heat_capacity ? energy / mass temperature # also specific entropy specific_energy ? energy / mass thermal_conductivity ? power / area (temperature/length) #energy_density ? energy / volume # conflicts with pressure electric_field ? force / charge # electric field strength electric_charge_density ? charge / volume electric_displacement ? charge / area # also electric flux density permittivity ? capacitance / length permeability ? inductance / length chemical_potential ? energy / amount # molar energy molar_entropy ? entropy / amount # also molar heat capacity radiation_exposure ? charge / mass # exposure (x- and γ-rays) absorbed_dose_rate ? specific_energy / time radiant_intensity ? power / solid_angle radiance ? power / solid_angle area reaction_rate ? amount / volume time # catalytic activity # concentration !endcategory !category quantities "Quantities" # # Quantities. These are shown within parentheses in every rink query. # dimensionless ? 1 jerk ? acceleration / time snap ? jerk / time crackle ? snap / time pop ? crackle / time linear_density ? mass / length kinematic_viscosity ? viscosity / density thermal_inductance ? energy temperature^2 / power^2 angular_momentum ? mass area / time impulse ? mass length / time moment_of_inertia ? mass area fuel_efficiency ? area^-1 molar_mass ? mass / amount flow_rate ? volume / time pressure_column ? pressure / length # XXX: conflates “biological activity” and “immunological activity” to # avoid a conflicting quantities warning; some biological agents have # more than one reference preparation and/or more than one type of # biological activity [WHO TRS 932 pp. 80–81], but it’s unclear how # we would map such agents to Rink’s substance/property model biological_activity ? IU biological_activity_density ? mass / biological_activity !endcategory !category metric_misc "Miscellaneous Metric Units" # # units derived easily from SI units # gram 1|1000 kg gm gram g gram tonne 1000 kg t tonne metricton tonne sthene tonne m / s^2 funal sthene pieze sthene / m^2 quintal 100 kg bar 1e5 Pa # About 1 atm #b bar vac millibar micron micrometer # One millionth of a meter bicron picometer # One brbillionth of a meter cc cm^3 are 100 m^2 a are liter 1000 cc # The liter was defined in 1901 as the oldliter 1.000028 dm^3 # space occupied by 1 kg of pure water at L liter # the temperature of its maximum density l liter # under a pressure of 1 atm. This was # supposed to be 1000 cubic cm, but it # was discovered that the original # measurement was off. In 1964, the # liter was redefined to be exactly 1000 # cubic centimeters. mho siemens # Inverse of ohm, hence ohm spelled backward galvat ampere # Named after Luigi Galvani angstrom 1e-10 m # Convenient for describing molecular sizes xunit xunit_cu # Used for measuring x-ray wavelengths. siegbahn xunit # Originally defined to be 1|3029.45 of xunit_cu 1.00207697e-13 m # the spacing of calcite planes at 18 xunit_mo 1.00209952e-13 m # degC. It was intended to be exactly # 1e-13 m, but was later found to be # slightly off. Current usage is with # reference to common x-ray lines, either # the K-alpha 1 line of copper or the # same line of molybdenum. angstromstar 1.00001495 angstrom # Defined by JA Bearden in 1965 fermi 1e-15 m # Convenient for describing nuclear sizes # Nuclear radius is from 1 to 10 fermis barn 1e-28 m^2 # Used to measure cross section for # particle physics collision, said to # have originated in the phrase "big as # a barn". shed 1e-24 barn # Defined to be a smaller companion to the # barn, but it's too small to be of # much use. brewster micron^2/N # measures stress-optical coef diopter /m # measures reciprocal of lens focal length fresnel 1e12 Hz # occasionally used in spectroscopy shake 1e-8 sec svedberg 1e-13 s # Used for measuring the sedimentation # coefficient for centrifuging. gamma microgram # Also used for 1e-9 tesla lambda microliter spat 1e12 m # Rarely used for astronomical measurements preece 1e13 ohm m # resistivity planck J s # action of one joule over one second sturgeon /henry # magnetic reluctance daraf 1/farad # elastance (farad spelled backwards) leo 10 m/s^2 poiseuille N s / m^2 # viscosity mayer J/g K # specific heat mired / microK # reciprocal color temperature. The name # abbreviates micro reciprocal degree. crocodile megavolt # used informally in UK physics labs metricounce 25 g mounce metricounce finsenunit 1e5 W/m^2 # Measures intensity of ultraviolet light # with wavelength 296.7 nm. fluxunit 1e-26 W/m^2 Hz # Used in radio astronomy to measure # the energy incident on the receiving # body across a specified frequency # bandwidth. [12] jansky fluxunit # K. G. Jansky identified radio waves coming Jy jansky # from outer space in 1931. flick W / cm^2 sr micrometer # Spectral radiance or irradiance pfu / cm^2 sr s # particle flux unit -- Used to measure # rate at which particles are received by # a spacecraft as particles per solid # angle per detector area per second. [18] pyron cal_IT / cm^2 min # Measures heat flow from solar radiation, # from Greek work "pyr" for fire. # to consume or produce on mol/sec. !endcategory !category time "Time" # # time # sec s minute 60 s min minute hour 60 min hr hour h hour day 24 hr d day da day week 7 day wk week sennight 7 day fortnight 14 day blink 1e-5 day # Actual human blink takes 1|3 second ce 1e-2 day cron 1e6 years watch 4 hours # time a sentry stands watch or a ship's # crew is on duty. bell 1|8 watch # Bell would be sounded every 30 minutes. !endcategory !category decimal_time "French Revolutionary Time" # French Revolutionary Time or Decimal Time. It was Proposed during # the French Revolution. A few clocks were made, but it never caught # on. In 1998 Swatch defined a time measurement called ".beat" and # sold some watches that displayed time in this unit. decimalhour 1|10 day decimalminute 1|100 decimalhour decimalsecond 1|100 decimalminute beat decimalminute # Swatch Internet Time !endcategory !category angular "Angular Measurements" # # angular measure # circle 2 pi radian degree 1|360 circle deg degree arcdeg degree arcmin 1|60 degree arcminute arcmin ' arcmin arcsec 1|60 arcmin arcsecond arcsec #" arcsec #'' " rightangle 90 degrees quadrant 1|4 circle quintant 1|5 circle sextant 1|6 circle sign 1|12 circle # Angular extent of one sign of the zodiac turn circle revolution turn rev turn pulsatance radian / sec gon 1|100 rightangle # measure of grade grade gon centesimalminute 1|100 grade centesimalsecond 1|100 centesimalminute milangle 1|6400 circle # Official NIST definition. # Another choice is 1e-3 radian. pointangle 1|32 circle # Used for reporting compass readings centrad 0.01 radian # Used for angular deviation of light # through a prism. mas milli arcsec # Used by astronomers seclongitude circle (seconds/day) # Astronomers measure longitude # (which they call right ascension) in # time units by dividing the equator into # 24 hours instead of 360 degrees. !endcategory !category solid_angles "Solid Angle Measurements" # # Solid angle measure # sphere 4 pi sr squaredegree 1|180^2 pi^2 sr squareminute 1|60^2 squaredegree squaresecond 1|60^2 squareminute squarearcmin squareminute squarearcsec squaresecond sphericalrightangle 0.5 pi sr octant 0.5 pi sr !endcategory !category concentrations "Concentrations" # # Concentration measures # percent 0.01 % percent mill 0.001 # Originally established by Congress in 1791 # as a unit of money equal to 0.001 dollars, # it has come to refer to 0.001 in general. # Used by some towns to set their property # tax rate, and written with a symbol similar # to the % symbol but with two 0's in the # denominator. [18] proof 1|200 # Alcohol content measured by volume at # 60 degrees Fahrenheit. This is a USA # measure. In Europe proof=percent. ppm 1e-6 partspermillion ppm ppb 1e-9 partsperbillion ppb # USA billion ppt 1e-12 partspertrillion ppt # USA trillion karat 1|24 # measure of gold purity caratgold karat gammil mg/l basispoint 0.01 % # Used in finance fine 1|1000 # Measure of gold purity !endcategory !category ph "pH Scale" # The pH scale is used to measure the concentration of hydronium (H3O+) ions in # a solution. A neutral solution has a pH of 7 as a result of dissociated # water molecules. #pH(x) units=[1;mol/liter] range=(0,) 10^(-x) mol/liter ; (-log(pH liters/mol)) !endcategory !category temp "Temperature" # # Temperature # # Two types of units are defined: units for converting temperature differences # and functions for converting absolute temperatures. Conversions for # differences start with "deg" and conversions for absolute temperature start # with "temp". # temperature_difference kelvin # In 1741 Anders Celsius introduced a temperature scale with water boiling at # 0 degrees and freezing at 100 degrees at standard pressure. After his death # the fixed points were reversed and the scale was called the centigrade # scale. Due to the difficulty of accurately measuring the temperature of # melting ice at standard pressure, the centigrade scale was replaced in 1954 # by the Celsius scale which is defined by subtracting 273.15 from the # temperature in Kelvins. This definition differed slightly from the old # centigrade definition, but the Kelvin scale depends on the triple point of # water rather than a melting point, so it can be measured accurately. # Fahrenheit defined his temperature scale by setting 0 to the coldest # temperature he could produce in his lab with a salt water solution and by # setting 96 degrees to body heat. In Fahrenheit's words: # # Placing the thermometer in a mixture of sal ammoniac or sea # salt, ice, and water a point on the scale will be found which # is denoted as zero. A second point is obtained if the same # mixture is used without salt. Denote this position as 30. A # third point, designated as 96, is obtained if the thermometer # is placed in the mouth so as to acquire the heat of a healthy # man." (D. G. Fahrenheit, Phil. Trans. (London) 33, 78, 1724) degreesrankine 5|9 K # The Rankine scale has the degrankine degreesrankine # Fahrenheit degree, but its zero degreerankine degreesrankine # is at absolute zero. degR degrankine tempR degrankine temprankine degrankine reaumur_absolute 10|8 kelvin romer_absolute 40|21 kelvin delisle_absolute -2|3 kelvin newton_absolute 100|33 kelvin zerocelsius 273.15 K zerofahrenheit zerocelsius - 32 degR zerodelisle 373.15 kelvin zeroromer zerocelsius - 7.5 romer_absolute degK K # "Degrees Kelvin" is forbidden usage. tempK K # For consistency !endcategory !category constants "Physical Constants" # # Physical constants # # Basic constants π 3.14159265358979323846 pi π τ 2 pi tau τ c speed of light # speed of light in vacuum (exact) #light c ?? The vacuum magnetic permeability constant μ_0. ?? Uncertainty is 1.5 x 10^-10. ?? 2018 CODATA recommended values mu0 1.25663706212e-6 N A^-2 # permeability of vacuum epsilon0 1/mu0 c^2 # permittivity of vacuum mass_energy c^2 # convert mass to energy ?? The Planck constant h. Defined as exactly 6.626 070 15 × 10^–34 J s. ?? 26th CGPM (2018, Resolution 1; CR, 210). planck_constant 6.62607015e-34 J s hbar planck_constant / 2 pi spin hbar ?? The Newtonian constant of gravitation, G. ?? Uncertainty is 1.5e-15. ?? 2018 CODATA recommended values G 6.67430e-11 N m^2 / kg^2 coulombconst 1/4 pi epsilon0 # listed as "k" sometimes ?? Δν_Cs, the unperturbed ground-state hyperfine transition frequency ?? of the caesium 133 atom. Value is exact by definition. ?? 26th CGPM (2018, CR; 211) v_Cs 9192631770 Hz # Physico-chemical constants ?? The atomic mass unit, or dalton, is 1|12th the mass of of a ?? carbon-12 atom in its ground state. ?? Uncertainty is 3.0 x 10^-10 kg ?? 2018 CODATA recommended values atomicmassunit 1.66053906660e-27 kg u atomicmassunit amu atomicmassunit amu_chem 1.66026e-27 kg # 1|16 of the weighted average mass of # the 3 naturally occuring neutral # isotopes of oxygen amu_phys 1.65981e-27 kg # 1|16 of the mass of a neutral # oxygen 16 atom dalton u # Maybe this should be amu_chem? ?? Avogadro constant, representing the number of particles in 1 mole. ?? Value is exact by definition. ?? 26th CGPM (2018, Resolution 1; CR, 210). avogadro 6.02214076e23/mol N_A avogadro gasconstant boltzmann N_A # molar gas constant R gasconstant ?? Boltzmann constant. Value is exact by definition. ?? 26th CGPM (2018, Resolution 1; CR, 210). boltzmann 1.380649e-23 J/K #k boltzmann kboltzmann boltzmann molarvolume mol R stdtemp / atm # Volume occupied by one mole of an # ideal gas at STP. loschmidt avogadro mol / molarvolume # Molecules per cubic meter of an # ideal gas at STP. Loschmidt did # work similar to Avogadro. stefanboltzmann pi^2 boltzmann^4 / 60 hbar^3 c^2 # The power per area radiated by a sigma stefanboltzmann # blackbody at temperature T is # given by sigma T^4. ?? Wien's Displacement Law gives the frequency at which the the ?? Planck spectrum has maximum intensity. The relation is lambda ?? T = b where lambda is wavelength, T is temperature and b is ?? the Wien displacement. This relation is used to determine the ?? temperature of stars. Defined exactly as hc / ku in terms of ?? the planck constant h, the speed of light c, the boltzmann ?? constant k, and the value u for which ?? 5*(1-exp(u)) + u*exp(u) = 0. Value is truncated. ?? 2018 CODATA recommended values wiendisplacement 2.897771955e-3 m K K_J 2 electroncharge / planck_constant K_J90 483597.9 GHz/V # Direct measurement of the volt is difficult. Until # recently, laboratories kept Weston cadmium cells as # a reference, but they could drift. In 1987 the # CGPM officially recommended the use of the # Josephson effect as a laboratory representation of # the volt. The Josephson effect occurs when two # superconductors are separated by a thin insulating # layer. A "supercurrent" flows across the insulator # with a frequency that depends on the potential # applied across the superconductors. This frequency # can be very accurately measured. The Josephson # constant K_J, which is equal to 2e/h, relates the # measured frequency to the potential. In 2019 the # values of the e and h were fixed, meaning that K_J # now has an exact value as well. Two values given, # the conventional (exact) value from 1990 and the # current definition. R_K planck_constant / electroncharge^2 R_K90 25812.807 ohm # Measurement of the ohm also presents difficulties. # The old approach involved maintaining resistances # that were subject to drift. The new standard is # based on the Hall effect. When a current carrying # ribbon is placed in a magnetic field, a potential # difference develops across the ribbon. The ratio # of the potential difference to the current is # called the Hall resistance. Klaus von Klitzing # discovered in 1980 that the Hall resistance varies # in discrete jumps when the magnetic field is very # large and the temperature very low. This enables # accurate realization of the resistance h/e^2 in the # lab. Two values given, the conventional (exact) # value from 1990 and the current CODATA measured # value. # Various conventional values gravity 9.80665 m/s^2 # std acceleration of gravity (exact) force gravity # use to turn masses into forces atm 101325 Pa # Standard atmospheric pressure atmosphere atm mach 331.46 m/s # speed of sound in dry air at STP standardtemp 273.15 K # standard temperature stdtemp standardtemp normaltemp 529.67 degR # for gas density, from NIST normtemp normaltemp # Handbook 44 # Atomic constants Rinfinity 10973731.568539 /m # The wavelengths of a spectral series R_H 10967760 /m # can be expressed as # 1/lambda = R (1/m^2 - 1/n^2). # where R is a number that various # slightly from element to element. # For hydrogen, R_H is the value, # and for heavy elements, the value # approaches Rinfinity, which can be # computed from # m_e c alpha^2 / 2 h # with a loss of 4 digits # of precision. ?? The fine structure constant α. ?? Measured as 7.297 352 5693(11) x 10^-3. ?? CODATA recommended values, 2018 alpha 7.2973525693e-3 # The fine structure constant was # introduced to explain fine # structure visible in spectral # lines. It can be computed from # mu0 c e^2 / 2 h # with a loss of 3 digits precision # and loss of precision in derived # values which use alpha. bohrradius alpha / 4 pi Rinfinity prout 185.5 keV # nuclear binding energy equal to 1|12 # binding energy of the deuteron # Planck constants ?? Equivalent to sqrt(hbar c / G). 2018 CODATA recommended values planckmass 2.176434e-8 kg m_P planckmass plancktime hbar / planckmass c^2 t_P plancktime plancklength plancktime c l_P plancklength # Magnetic moments bohrmagneton electroncharge hbar / mass of 2 electron mu_B bohrmagneton nuclearmagneton electroncharge hbar / mass of 2 proton mu_N nuclearmagneton # # Units derived from physical constants # kgf kg force technicalatmosphere kgf / cm^2 at technicalatmosphere hyl kgf s^2 / m # Also gram-force s^2/m according to [15] torr atm / 760 # These units, both named after Evangelista tor Pa # Torricelli, should not be confused. The eV electroncharge V # Energy acquired by a particle with charge e electronvolt eV # when it is accelerated through 1 V lightyear c julianyear # The 365.25 day year is specified in ly lightyear # NIST publication 811 lightsecond c s lightminute c min ?? A parsec was the distance at which a star will have a parallax of 1 ?? arcsecond as seen from Earth. In 2015, IAU Resolution B2 redefined ?? the parsec to be exactly 648 000|pi astronomical units. parsec 648000|pi au pc parsec #parsec au / tan(arcsec) # Unit of length equal to distance #pc parsec # from the sun to a point having # heliocentric parallax of 1 # arcsec (derived from parallax # second). A distant object with # paralax theta will be about # (arcsec/theta) parsecs from the # sun (using the approximation # that tan(theta) = theta). rydberg planck_constant c Rinfinity # Rydberg energy crith 0.089885 gram # The crith is the mass of one # liter of hydrogen at standard # temperature and pressure. amagatvolume molarvolume amagat mol/amagatvolume # Used to measure gas densities lorentz bohrmagneton / planck_constant c # Used to measure the extent # that the frequency of light # is shifted by a magnetic field. cminv planck_constant c / cm # Unit of energy used in infrared invcm cminv # spectroscopy. wavenumber cminv kcal_mol kcal_th / mol N_A # kcal/mol is used as a unit of # energy by physical chemists. !endcategory !category cgs "CGS Units" # # CGS system based on centimeter, gram and second # dyne cm gram / s^2 # force dyn dyne erg cm dyne # energy poise gram / cm s # viscosity, honors Jean Poiseuille P poise rhe /poise # reciprocal viscosity stokes cm^2 / s # kinematic viscosity St stokes stoke stokes lentor stokes # old name Gal cm / s^2 # acceleration, used in geophysics galileo Gal # for earth's gravitational field # (note that "gal" is for gallon # but "Gal" is the standard symbol # for the gal which is evidently a # shortened form of "galileo".) barye dyne/cm^2 # pressure barad barye # old name kayser 1/cm # Proposed as a unit for wavenumber balmer kayser # Even less common name than "kayser" kine cm/s # velocity bole g cm / s # momentum pond gram force glug gram force s^2 / cm # Mass which is accelerated at # 1 cm/s^2 by 1 gram force darcy centipoise cm^2 / s atm # Measures permeability to fluid flow. # One darcy is the permeability of a # medium that allows a flow of cc/s # of a liquid of centipoise viscosity # under a pressure gradient of # atm/cm. Named for H. Darcy. mobileohm cm / dyn s # mobile ohm, measure of mechanical # mobility mechanicalohm dyn s / cm # mechanical resistance acousticalohm dyn s / cm^5 # ratio of the sound pressure of # 1 dyn/cm^2 to a source of strength # 1 cm^3/s ray acousticalohm rayl dyn s / cm^3 # Specific acoustical resistance eotvos 1e-9 Gal/cm # Change in gravitational acceleration # over horizontal distance # Electromagnetic units derived from the abampere abampere 10 A # Current which produces a force of abamp abampere # 2 dyne/cm between two infinitely aA abampere # long wires that are 1 cm apart biot aA # alternative name for abamp Bi biot abcoulomb abamp sec abcoul abcoulomb abfarad abampere sec / abvolt abhenry abvolt sec / abamp abvolt dyne cm / abamp sec abohm abvolt / abamp abmho /abohm gauss abvolt sec / cm^2 Gs gauss maxwell abvolt sec # Also called the "line" Mx maxwell oersted gauss / mu0 Oe oersted gilbert gauss cm / mu0 Gi gilbert unitpole 4 pi maxwell emu erg/gauss # "electro-magnetic unit", a measure of # magnetic moment, often used as emu/cm^3 # to specify magnetic moment density. # Gaussian system: electromagnetic units derived from statampere. # # Note that the Gaussian units are often used in such a way that Coulomb's law # has the form F= q1 * q2 / r^2. The constant 1|4*pi*epsilon0 is incorporated # into the units. From this, we can get the relation force=charge^2/dist^2. # This means that the simplification esu^2 = dyne cm^2 can be used to simplify # units in the Gaussian system, with the curious result that capacitance can be # measured in cm, resistance in sec/cm, and inductance in sec^2/cm. These # units are given the names statfarad, statohm and stathenry below. statampere 10 A cm / s c statamp statampere statvolt dyne cm / statamp sec statcoulomb statamp s esu statcoulomb statcoul statcoulomb statfarad statamp sec / statvolt cmcapacitance statfarad stathenry statvolt sec / statamp statohm statvolt / statamp statmho /statohm statmaxwell statvolt sec franklin statcoulomb debye 1e-18 statcoul cm # unit of electrical dipole moment helmholtz debye/angstrom^2 # Dipole moment per area jar 1000 statfarad # approx capacitance of Leyden jar # # Some historical electromagnetic units # intampere 0.999835 A # Defined as the current which in one intamp intampere # second deposits .001118 gram of # silver from an aqueous solution of # silver nitrate. intfarad 0.999505 F intvolt 1.00033 V intohm 1.000495 ohm # Defined as the resistance of a # uniform column of mercury containing # 14.4521 gram in a column 1.063 m # long and maintained at 0 degC. daniell 1.042 V # Meant to be electromotive force of a # Daniell cell, but in error by .04 V faraday N_A electroncharge mol # Charge that must flow to deposit or faraday_phys 96521.9 C # liberate one gram equivalent of any faraday_chem 96495.7 C # element. (The chemical and physical # values are off slightly from what is # obtained by multiplying by amu_chem # or amu_phys. These values are from # a 1991 NIST publication.) Note that # there is a Faraday constant which is # equal to N_A e and hence has units of # C/mol. kappline 6000 maxwell # Named by and for Gisbert Kapp siemensunit 0.9534 ohm # Resistance of a meter long column of # mercury with a 1 mm cross section. !endcategory !category circuit_board "Printed circuit board units" # # Printed circuit board units. # # http://www.ndt-ed.org/GeneralResources/IACS/IACS.htm. # # Conductivity is often expressed as a percentage of IACS. A copper wire a # meter long with a 1 mm^2 cross section has a resistance of 1|58 ohm at # 20 deg C. Copper density is also standarized at that temperature. # copperconductivity 58 siemens m / mm^2 # A wire a meter long with IACS copperconductivity # a 1 mm^2 cross section copperdensity 8.89 g/cm^3 # The "ounce" measures the ouncecopper oz / ft^2 copperdensity # thickness of copper used ozcu ouncecopper # in circuitboard fabrication !endcategory !category radiometric "Radiometric Units" # # Radiometric units # # radiant_energy energy # Basic unit of radiation # radiant_energy_density energy / volume # radiant_flux power # spectral_flux_frequency power / frequency spectral_flux_wavelength ? power / length spectral_intensity_frequency ? power / solid_angle frequency spectral_intensity_wavelength ? power / solid_angle length spectral_radiance_frequency ? power / solid_angle area frequency spectral_radiance_wavelength ? power / solid_angle volume # spectral_irradiance_frequency power / area frequency spectral_irradiance_wavelength ? power / volume # radiosity power / area # spectral_radiosity_frequency power / area frequency # spectral_radiosity_wavelength power / volume # radiant_exitance power / area # spectral_exitance_frequency power / area frequency # spectral_exitance_wavelength power / volume # radiant_exposure energy / area spectral_exposure_frequency ? energy / area frequency # spectral_exposure_wavelength energy / volume !endcategory !category photometric "Photometric Units" # # Photometric units # luminous_energy ? luminous_flux time candle 1.02 candela # Standard unit for luminous intensity hefnerunit 0.9 candle # in use before candela hefnercandle hefnerunit # violle 20.17 cd # luminous intensity of 1 cm^2 of # platinum at its temperature of # solidification (2045 K) talbot lumen s # Luminous energy lumberg talbot # References give these values for lumerg talbot # lumerg and lumberg both. Note that # a paper from 1948 suggests that # lumerg should be 1e-7 talbots so # that lumergs/erg = talbots/joule. # lumerg = luminous erg phot lumen / cm^2 # ph phot # footcandle lumen/ft^2 # Illuminance from a 1 candela source # at a distance of one foot metercandle lumen/m^2 # Illuminance from a 1 candela source # at a distance of one meter mcs metercandle s # luminous energy per area, used to # measure photographic exposure nox 1e-3 lux # These two units were proposed for skot 1e-3 apostilb # measurements relating to dark adapted # eyes. # Luminance measures nit cd/m^2 # Luminance: the intensity per projected stilb cd / cm^2 # area of an extended luminous source. sb stilb # (nit is from latin nitere = to shine.) apostilb cd/pi m^2 asb apostilb blondel apostilb # Named after a French scientist. # Equivalent luminance measures. These units are units which measure # the luminance of a surface with a specified exitance which obeys # Lambert's law. (Lambert's law specifies that luminous intensity of # a perfectly diffuse luminous surface is proportional to the cosine # of the angle at which you view the luminous surface.) equivalentlux cd / pi m^2 # luminance of a 1 lux surface equivalentphot cd / pi cm^2 # luminance of a 1 phot surface lambert cd / pi cm^2 footlambert cd / pi ft^2 # The bril is used to express "brilliance" of a source of light on a # logarithmic scale to correspond to subjective perception. An increase of 1 # bril means doubling the luminance. A luminance of 1 lambert is defined to # have a brilliance of 1 bril. #bril(x) units=[1;lambert] 2^(x+-100) lamberts ;log2(bril/lambert)+100 # # Photographic Exposure Value # This section by Jeff Conrad (jeff_conrad@msn.com) # # The Additive system of Photographic EXposure (APEX) proposed in ASA # PH2.5-1960 was an attempt to simplify exposure determination for people who # relied on exposure tables rather than exposure meters. Shortly thereafter, # nearly all cameras incorporated exposure meters, so the APEX system never # caught on, but the concept of exposure value remains in use. Though given as # 'Ev' in ASA PH2.5-1960, it is now more commonly indicated by 'EV'. EV is # related to exposure parameters by # # A^2 LS ES # 2^EV = --- = -- = -- # t K C # # Where # A = Relative aperture (f-number) # t = Exposure time in seconds # L = Scene luminance in cd/m2 # E = Scene illuminance in lux # S = Arithmetic ISO speed # K = Reflected-light meter calibration constant # C = Incident-light meter calibration constant # # Strictly, an exposure value is a combination of aperture and exposure time, # but it's also commonly used to indicate luminance (or illuminance). # Conversion to luminance or illuminance units depends on the ISO speed and the # meter calibration constant. Common practice is to use an ISO speed of 100. # Calibration constants vary among camera and meter manufacturers: Canon, # Nikon, and Sekonic use a value of 12.5 for reflected-light meters, while # Kenko (formerly Minolta) and Pentax use a value of 14. Kenko and Sekonic use # a value of 250 for incident-light meters with flat receptors. # # The values for in-camera meters apply only averaging, weighted-averaging, or # spot metering--the multi-segment metering incorporated in most current # cameras uses proprietary algorithms that evaluate many factors related to the # luminance distribution of what is being metered; they are not amenable to # simple conversions, and are usually not disclosed by the manufacturers. s100 100 / lx s # ISO 100 speed iso100 s100 # Reflected-light meter calibration constant with ISO 100 speed k1250 12.5 (cd/m^2) / lx s # For Canon, Nikon, and Sekonic k1400 14 (cd/m^2) / lx s # For Kenko (Minolta) and Pentax # Incident-light meter calibration constant with ISO 100 film c250 250 lx / lx s # flat-disc receptor # Exposure value to scene luminance with ISO 100 imaging media # For Kenko (Minolta) or Pentax #ev100(x) units=[;cd/m^2] range=(0,) 2^x k1400 / s100; log2(ev100 s100/k1400) # For Canon, Nikon, or Sekonic #ev100(x) units=[1;cd/m^2] range=(0,) 2^x k1250 / s100; log2(ev100 s100/k1250) #EV100() ev100 # Exposure value to scene illuminance with ISO 100 imaging media #iv100(x) units=[1;lx] range=(0,) 2^x c250 / s100; log2(iv100 s100 / c250) # Other Photographic Exposure Conversions # # As part of APEX, ASA PH2.5-1960 proposed several logarithmic quantities # related by # # Ev = Av + Tv = Bv + Sv # # where # Av = log2(A^2) Aperture value # Tv = log2(1/t) Time value # Sv = log2(N Sx) Speed value # Bv = log2(B S / K) Luminance ("brightness") value # Iv = log2(I S / C) Illuminance value # # and # A = Relative aperture (f-number) # t = Exposure time in seconds # Sx = Arithmetic ISO speed in 1/lux s # B = luminance in cd/m2 # I = luminance in lux # The constant N derives from the arcane relationship between arithmetic # and logarithmic speed given in ASA PH2.5-1960. That relationship # apparently was not obvious--so much so that it was thought necessary # to explain it in PH2.12-1961. The constant has had several values # over the years, usually without explanation for the changes. Although # APEX had little impact on consumer cameras, it has seen a partial # resurrection in the Exif standards published by the Camera & Imaging # Products Association of Japan. #N_apex 2^-1.75 lx s # precise value implied in ASA PH2.12-1961, # derived from ASA PH2.5-1960. #N_apex 0.30 lx s # rounded value in ASA PH2.5-1960, # ASA PH2.12-1961, and ANSI PH2.7-1986 #N_apex 0.3162 lx s # value in ANSI PH2.7-1973 N_exif 1|3.125 lx s # value in Exif 2.3 (2010), making Sv(5) = 100 K_apex1961 11.4 (cd/m^2) / lx s # value in ASA PH2.12-1961 K_apex1971 12.5 (cd/m^2) / lx s # value in ANSI PH3.49-1971; more common C_apex1961 224 lx / lx s # value in PH2.12-1961 (20.83 for I in # footcandles; flat sensor?) C_apex1971 322 lx / lx s # mean value in PH3.49-1971 (30 +/- 5 for I in # footcandles; hemispherical sensor?) N_speed N_exif K_lum K_apex1971 C_illum C_apex1961 # Units for Photographic Exposure Variables # # Practical photography sometimes pays scant attention to units for exposure # variables. In particular, the "speed" of the imaging medium is treated as if # it were dimensionless when it should have units of reciprocal lux seconds; # this practice works only because "speed" is almost invariably given in # accordance with international standards (or similar ones used by camera # manufacturers)--so the assumed units are invariant. In calculating # logarithmic quantities--especially the time value Tv and the exposure value # EV--the units for exposure time ("shutter speed") are often ignored; this # practice works only because the units of exposure time are assumed to be in # seconds, and the missing units that make the argument to the logarithmic # function dimensionless are silently provided. # # In keeping with common practice, the definitions that follow treat "speeds" # as dimensionless, so ISO 100 speed is given simply as '100'. When # calculating the logarithmic APEX quantities Av and Tv, the definitions # provide the missing units, so the times can be given with any appropriate # units. For example, giving an exposure time of 1 minute as either '1 min' or # '60 s' will result in Tv of -5.9068906. # # Exposure Value from f-number and Exposure Time # # Because nonlinear unit conversions only accept a single quantity, # there is no direct conversion from f-number and exposure time to # exposure value EV. But the EV can be obtained from a combination of # Av and Tv. For example, the "sunny 16" rule states that correct # exposure for a sunlit scene can achieved by using f/16 and an exposure # time equal to the reciprocal of the ISO speed in seconds; this can be # calculated as # # ~Av(16) + ~Tv(1|100 s), # # which gives 14.643856. These conversions may be combined with the # ev100 conversion: # # ev100(~Av(16) + ~Tv(1|100 s)) # # to yield the assumed average scene luminance of 3200 cd/m^2. # convert relative aperture (f-number) to aperture value #Av(A) units=[1;1] domain=[-2,) range=[0.5,) 2^(A/2); 2 log2(Av) # convert exposure time to time value #Tv(t) units=[1;s] range=(0,) 2^(-t) s; log2(s / Tv) # convert logarithmic speed Sv in ASA PH2.5-1960 to ASA/ISO arithmetic speed; # make arithmetic speed dimensionless # 'Sv' conflicts with the symbol for sievert; you can uncomment this function # definition if you don't need that symbol #Sv(S) units=[1;1] range=(0,) 2^S / (N_speed/lx s); log2((N_speed/lx s) Sv) #Sval(S) units=[1;1] range=(0,) 2^S / (N_speed/lx s); log2((N_speed/lx s) Sval) # convert luminance value Bv in ASA PH2.12-1961 to luminance #Bv(x) units=[1;cd/m^2] range=(0,) \ # 2^x K_lum N_speed ; log2(Bv / (K_lum N_speed)) # convert illuminance value Iv in ASA PH2.12-1961 to illuminance #Iv(x) units=[1;lx] range=(0,) \ # 2^x C_illum N_speed ; log2(Iv / (C_illum N_speed)) # convert ASA/ISO arithmetic speed Sx to ASA logarithmic speed in # ASA PH2.5-1960; make arithmetic speed dimensionless #Sx(S) units=[1;1] domain=(0,) \ # log2((N_speed/lx s) S); 2^Sx / (N_speed/lx s) # convert DIN speed/ISO logarithmic speed in ISO 6:1993 to arithmetic speed # for convenience, speed is treated here as if it were dimensionless #Sdeg(S) units=[1;1] range=(0,) 10^((S - 1) / 10) ; (1 + 10 log(Sdeg)) #Sdin() Sdeg # Numerical Aperture and f-Number of a Lens # # The numerical aperture (NA) is given by # # NA = n sin(theta) # # where n is the index of refraction of the medium and theta is half # of the angle subtended by the aperture stop from a point in the image # or object plane. For a lens in air, n = 1, and # # NA = 0.5 / f-number # # convert NA to f-number #numericalaperture(x) units=[1;1] domain=(0,1] range=[0.5,) \ # 0.5 / x ; 0.5 / numericalaperture #NA() numericalaperture # # convert f-number to itself; restrict values to those possible #fnumber(x) units=[1;1] domain=[0.5,) range=[0.5,) x ; fnumber # Referenced Photographic Standards # # ASA PH-2.5-1960. USA Standard, Method for Determining (Monochrome, # Continuous-Tone) Speed of Photographic Negative Materials. # ASA PH2.12-1961. American Standard, General-Purpose Photographic # Exposure Meters (photoelectric type). # ANSI PH3.49-1971. American National Standard for general-purpose # photographic exposure meters (photoelectric type). # ANSI PH2.7-1973. American National Standard Photographic Exposure Guide. # ANSI PH2.7-1986. American National Standard for Photography -- # Photographic Exposure Guide. # CIPA DC-008-2010. Exchangeable image file format for digital still # cameras: Exif Version 2.3 # ISO 6:1993. International Standard, Photography -- Black-and-white # pictorial still camera negative film/process systems -- # Determination of ISO Speed. !endcategory !category astronomical_time "Astronomical time measurements" # # Astronomical time measurements # # Astronomical time measurement is a complicated matter. The length of the # true day at a given place can be 21 seconds less than 24 hours or 30 seconds # over 24 hours. The two main reasons for this are the varying speed of the # earth in its elliptical orbit and the fact that the sun moves on the ecliptic # instead of along the celestial equator. To devise a workable system for time # measurement, Simon Newcomb (1835-1909) used a fictitious "mean sun". # Consider a first fictitious sun traveling along the ecliptic at a constant # speed and coinciding with the true sun at perigee and apogee. Then # considering a second fictitious sun traveling along the celestial equator at # a constant speed and coinciding with the first fictitious sun at the # equinoxes. The second fictitious sun is the "mean sun". From this equations # can be written out to determine the length of the mean day, and the tropical # year. The length of the second was determined based on the tropical year # from such a calculation and was officially used from 1960-1967 until atomic # clocks replaced astronomical measurements for a standard of time. All of the # values below give the mean time for the specified interval. # # See "Mathematical Astronomy Morsels" by Jean Meeus for more details # and a description of how to compute the correction to mean time. # anomalisticyear 365.2596 days # The time between successive # perihelion passages of the # earth. siderealyear 365.256360417 day # The time for the earth to make # one revolution around the sun # relative to the stars. tropicalyear 365.242198781 day # The time needed for the mean sun # as defined above to increase # its longitude by 360 degrees. # Most references defined the # tropical year as the interval # between vernal equinoxes, but # this is misleading. The length # of the season changes over time # because of the eccentricity of # the earth's orbit. The time # between vernal equinoxes is # approximately 365.24237 days # around the year 2000. See # "Mathematical Astronomy # Morsels" for more details. eclipseyear 346.62 days # The line of nodes is the # intersection of the plane of # Earth's orbit around the sun # with the plane of the moon's # orbit around earth. Eclipses # can only occur when the moon # and sun are close to this # line. The line rotates and # appearances of the sun on the # line of nodes occur every # eclipse year. saros 223 synodicmonth # The earth, moon and sun appear in # the same arrangement every # saros, so if an eclipse occurs, # then one saros later, a similar # eclipse will occur. (The saros # is close to 19 eclipse years.) # The eclipse will occur about # 120 degrees west of the # preceeding one because the # saros is not an even number of # days. After 3 saros, an # eclipse will occur at # approximately the same place. siderealday 86164.09054 s # The sidereal day is the interval siderealhour 1|24 siderealday # between two successive transits siderealminute 1|60 siderealhour # of a star over the meridian, siderealsecond 1|60 siderealminute # or the time required for the # earth to make one rotation # relative to the stars. The # more usual solar day is the # time required to make a # rotation relative to the sun. # Because the earth moves in its # orbit, it has to turn a bit # extra to face the sun again, # hence the solar day is slightly # longer. anomalisticmonth 27.55454977 day # Time for the moon to travel from # perigee to perigee nodicalmonth 27.2122199 day # The nodes are the points where draconicmonth nodicalmonth # an orbit crosses the ecliptic. draconiticmonth nodicalmonth # This is the time required to # travel from the ascending node # to the next ascending node. siderealmonth 27.321661 day # Time required for the moon to # orbit the earth lunarmonth 29 days + 12 hours + 44 minutes + 2.8 seconds # Mean time between full moons. synodicmonth lunarmonth # Full moons occur when the sun lunation synodicmonth # and moon are on opposite sides lune 1|30 lunation # of the earth. Since the earth lunour 1|24 lune # moves around the sun, the moon # has to revolve a bit extra to # get into the full moon # configuration. year tropicalyear yr year month 1|12 year mo month lustrum 5 years # The Lustrum was a Roman # purification ceremony that took # place every five years. # Classically educated Englishmen # used this term. decade 10 years century 100 years millennium 1000 years millennia millennium solaryear year lunaryear 12 lunarmonth calendaryear 365 day commonyear 365 day leapyear 366 day julianyear 365.25 day gregorianyear 365.2425 day islamicyear 354 day # A year of 12 lunar months. They islamicleapyear 355 day # began counting on July 16, AD 622 # when Muhammad emigrated to Medina # (the year of the Hegira). They need # 11 leap days in 30 years to stay in # sync with the lunar year which is a # bit longer than the 29.5 days of the # average month. The months do not # keep to the same seasons, but # regress through the seasons every # 32.5 years. islamicmonth 1|12 islamicyear # They have 29 day and 30 day months. # The Hewbrew year is also based on lunar months, but synchronized to the solar # calendar. The months vary irregularly between 29 and 30 days in length, and # the years likewise vary. The regular year is 353, 354, or 355 days long. To # keep up with the solar calendar, a leap month of 30 days is inserted every # 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years of a 19 year cycle. This # gives leap years that last 383, 384, or 385 days. !endcategory !category earth_moon "Earth and Moon" # Objects on the earth are charted relative to a perfect ellipsoid whose # dimensions are specified by different organizations. The ellipsoid is # specified by an equatorial radius and a flattening value which defines the # polar radius. These values are the 1996 values given by the International # Earth Rotation Service (IERS) whose reference documents can be found at # http://maia.usno.navy.mil/ earthflattening 1|298.25642 earthradius_equatorial 6378136.49 m earthradius_polar (-earthflattening+1) earthradius_equatorial landarea 148.847e6 km^2 oceanarea 361.254e6 km^2 moonradius 1738 km # mean value sunradius 6.96e8 m # Many astronomical values can be measured most accurately in a system of units # using the astronomical unit and the mass of the sun as base units. The # uncertainty in the gravitational constant makes conversion to SI units # significantly less accurate. # The astronomical unit was defined to be the length of the of the semimajor # axis of a massless object with the same year as the earth. With such a # definition in force, and with the mass of the sun set equal to one, Kepler's # third law can be used to solve for the value of the gravitational constant. # Kepler's third law says that (2 pi / T)^2 a^3 = G M where T is the orbital # period, a is the size of the semimajor axis, G is the gravitational constant # and M is the mass. With M = 1 and T and a chosen for the earth's orbit, we # find sqrt(G) = (2 pi / T) sqrt(AU^3). This constant is called the Gaussian # gravitational constant, apparently because Gauss originally did the # calculations. However, when the original calculation was done, the value # for the length of the earth's year was inaccurate. The value used is called # the Gaussian year. Changing the astronomical unit to bring it into # agreement with more accurate values for the year would have invalidated a # lot of previous work, so instead the astronomical unit has been kept equal # to this original value. This is accomplished by using a standard value for # the Gaussian gravitational constant. This constant is called k. # Many values below are from http://ssd.jpl.nasa.gov/?constants gauss_k 0.01720209895 # This beast has dimensions of # au^(3|2) / day and is exact. gaussianyear (2 pi / gauss_k) days # Year that corresponds to the Gaussian # gravitational constant. This is a # fictional year, and doesn't # correspond to any celestial event. ?? Represents approximately the distance between the Earth and the Sun. ?? Defined as exactly 149 597 870 700 m in 2012 by IAU Resolution B2. astronomicalunit 149597870700 m au astronomicalunit # ephemeris for the above described # astronomical unit. (See the NASA # site listed above.) !endcategory !category atomic "Atomic Units" # # The Hartree system of atomic units, derived from fundamental units # of mass (of electron), action (planck's constant), charge, and # the coulomb constant. # # Fundamental units atomicmass electronmass atomiccharge electroncharge atomicaction hbar # derived units (Warning: accuracy is lost from deriving them this way) atomiclength bohrradius atomictime hbar^3/coulombconst^2 atomicmass electroncharge^4 # Period of first # bohr orbit atomicvelocity atomiclength / atomictime atomicenergy hbar / atomictime hartree atomicenergy !endcategory !category thermal_entropy "Thermal entropy units" # # These thermal units treat entropy as charge, from [5] # thermalcoulomb J/K # entropy thermalampere W/K # entropy flow thermalfarad J/K^2 thermalohm K^2/W # thermal resistance fourier thermalohm thermalhenry J K^2/W^2 # thermal inductance thermalvolt K # thermal potential difference !endcategory ############################################################################# # # # United States units # # # ############################################################################# !category us_survey "US Survey Measures" # Survey measures # The US Metric Law of 1866 legalized the metric system in the USA and # defined the meter in terms of the British system with the exact # 1 meter = 39.37 inches. On April 5, 1893 Thomas Corwin Mendenhall, # Superintendent of Weights and Measures, decided, in what has become # known as the "Mendenhall Order" that the meter and kilogram would be the # fundamental standards in the USA. The definition from 1866 was turned # around to give an exact definition of the yard as 3600|3937 meters This # definition was used until July of 1959 when the definition was changed # to bring the US and other English-speaking countries into agreement; the # Canadian value of 1 yard = 0.9144 meter (exactly) was chosen because it # was approximately halfway between the British and US values; it had the # added advantage of making 1 inch = 25.4 mm (exactly). Since 1959, the # "international" foot has been exactly 0.3048 meters. At the same time, # it was decided that any data expressed in feet derived from geodetic # surveys within the US would continue to use the old definition and call # the old unit the "survey foot." The US continues to define the statute # mile, furlong, chain, rod, link, and fathom in terms of the US survey # foot. # Sources: # NIST Special Publication 447, Sects. 5, 7, and 8. # NIST Handbook 44, 2011 ed., Appendix C. # Canadian Journal of Physics, 1959, 37:(1) 84, 10.1139/p59-014. surveyfoot 1200|3937 m surveyfeet surveyfoot surveyft surveyfoot surveyinch 1|12 surveyfoot surveyinches surveyinch surveyin surveyinch surveyyard 3 surveyfoot surveyyd surveyyard surveymile 5280 surveyfoot surveymi surveymile !endcategory !category int_customary "International Customary Length Measures" # International measures ?? International yard and pound, since July 1, 1959. inch 2.54 cm inches inch in inch ?? International yard and pound, since July 1, 1959. foot 12 inch feet foot ft foot ?? International yard and pound, since July 1, 1959. yard 3 ft yd yard ?? International yard and pound, since July 1, 1959. mile 5280 ft # The mile was enlarged from 5000 ft mi mile # to this number in order to make # it an even number of furlongs. # (The Roman mile is 5000 romanfeet.) line 1|12 inch # Also defined as '.1 in' or as '1e-8 Wb' rod 5.5 yard perch rod pole rod furlong 40 rod # From "furrow long" statutemile mile league 3 mile # aliases for international units intinch inch intinches inch intin in intfoot foot intfeet foot intft foot intyard yard intyd yard intmile mile intmi mile intline line introd rod intperch perch intfurlong furlong intleague league !endcategory !category us_survey "US Survey Measures" # surveyor's measure surveyorschain 66 surveyft surveychain surveyorschain gunterschain surveyorschain surveyorspole 1|4 surveyorschain surveyorslink 1|100 surveyorschain surveyacre 10 surveychain^2 surveyacrefoot surveyacre surveyfoot chain 66 intfoot link 1|100 chain acre 10 chain^2 # Acre based on international ft acrefoot acre foot ch chain intchain chain intlink link intacrefoot acrefoot intacre acre section mile^2 township 36 section homestead 160 acre # Area of land granted by the 1862 Homestead # Act of the United States Congress engineerschain 100 ft engineerslink 1|100 engineerschain ramsdenschain engineerschain ramsdenslink engineerslink gurleychain 33 feet # Andrew Ellicott chain is the gurleylink 1|50 gurleychain # same length wingchain 66 feet # Chain from 1664, introduced by winglink 1|80 wingchain # Vincent Wing, also found in a # 33 foot length with 40 links. # early US length standards # The US has had four standards for the yard: one by Troughton of London # (1815); bronze yard #11 (1856); the Mendhall yard (1893), consistent # with the definition of the meter in the metric joint resolution of # Congress in 1866, but defining the yard in terms of the meter; and the # international yard (1959), which standardized definitions for Australia, # Canada, New Zealand, South Africa, the UK, and the US. # Sources: Pat Naughtin (2009), Which Inch?, www.metricationmatters.com; # Lewis E. Barbrow and Lewis V. Judson (1976). NBS Special Publication # 447, Weights and Measures Standards of the United States: A Brief # History. troughtonyard 914.42190 mm bronzeyard11 914.39980 mm mendenhallyard surveyyard internationalyard yard !endcategory !category int_nautical "International Nautical Units" # international nautical measures intfathom 6 ft # Originally defined as the distance from # fingertip to fingertip with arms fully # extended. intnauticalmile 1852 m # Supposed to be one minute of latitude at # the equator. That value is about 1855 m. # Early estimates of the earth's circumference # were a bit off. The value of 1852 m was # made the international standard in 1929. # The US did not accept this value until # 1954. The UK switched in 1970. fathom intfathom nauticalmile intnauticalmile intcable 1|10 nauticalmile cable intcable # international cable cablelength cable !endcategory !category us_nautical "US Survey Nautical Units" # survey nautical measures surveynauticalmile 6080.20 surveyfoot # Before 1954 surveyfathom 6 surveyfoot surveycable 100 surveyfathom navycablelength 720 surveyft # used for depth in water marineleague 3 nauticalmile geographicalmile brnauticalmile knot nauticalmile / hr click km # US military slang klick click !endcategory !category avoirdupois "Avoirdupois Weights" # Avoirdupois weight ?? International yard and pound, since July 1, 1959. Avoirdupois. pound 0.45359237 kg # The one normally used lb pound # From the latin libra grain 1|7000 pound # The grain is the same in all three # weight systems. It was originally # defined as the weight of a barley # corn taken from the middle of the # ear. ounce 1|16 pound oz ounce dram 1|16 ounce dr dram ushundredweight 100 pounds cwt hundredweight shorthundredweight ushundredweight uston shortton shortton 2000 lb quarterweight 1|4 uston shortquarterweight 1|4 shortton shortquarter shortquarterweight !endcategory !category troy "Troy Weights" # Troy Weight. In 1828 the troy pound was made the first United States # standard weight. It was to be used to regulate coinage. troypound 5760 grain troyounce 1|12 troypound ozt troyounce pennyweight 1|20 troyounce # Abbreviated "d" in reference to a dwt pennyweight # Frankish coin called the "denier" # minted in the late 700's. There # were 240 deniers to the pound. assayton mg ton / troyounce # mg / assayton = troyounce / ton usassayton mg uston / troyounce brassayton mg brton / troyounce fineounce troyounce # A troy ounce of 99.5% pure gold !endcategory !category jewelers "Jewelers' Units" # Some other jewelers units metriccarat 0.2 gram # Defined in 1907 metricgrain 50 mg carat metriccarat ct carat jewelerspoint 1|100 carat silversmithpoint 1|4000 inch momme 3.75 grams # Traditional Japanese unit based # on the chinese mace. It is used for # pearls in modern times and also for # silk density. The definition here # was adopted in 1891. !endcategory !category apothecary "Apothecaries' Weights" # Apothecaries' weight appound troypound apounce troyounce apdram 1|8 apounce apscruple 1|3 apdram !endcategory !category us_volume "US Volume Measures" # Liquid measure usgallon 231 in^3 # US liquid measure is derived from gal gallon # the British wine gallon of 1707. quart 1|4 gallon # See the "winegallon" entry below pint 1|2 quart # more historical information. gill 1|4 pint usquart 1|4 usgallon uspint 1|2 usquart usgill 1|4 uspint usfluidounce 1|16 uspint fluiddram 1|8 usfloz minimvolume 1|60 fluiddram qt quart pt pint floz fluidounce usfloz usfluidounce fldr fluiddram liquidbarrel 31.5 usgallon usbeerbarrel 2 beerkegs beerkeg 15.5 usgallon # Various among brewers ponykeg 1|2 beerkeg winekeg 12 usgallon petroleumbarrel 42 usgallon # Originated in Pennsylvania oil barrel petroleumbarrel # fields, from the winetierce bbl barrel ushogshead 2 liquidbarrel usfirkin 9 usgallon # Dry measures: The Winchester Bushel was defined by William III in 1702 and # legally adopted in the US in 1836. usbushel 2150.42 in^3 # Volume of 8 inch cylinder with 18.5 bu bushel # inch diameter (rounded) peck 1|4 bushel uspeck 1|4 usbushel brpeck 1|4 brbushel pk peck drygallon 1|2 uspeck dryquart 1|4 drygallon drypint 1|2 dryquart drybarrel 7056 in^3 # Used in US for fruits, vegetables, # and other dry commodities except for # cranberries. cranberrybarrel 5826 in^3 # US cranberry barrel heapedbushel 1.278 usbushel# The following explanation for this # value was provided by Wendy Krieger # based on # guesswork. The cylindrical vessel is # 18.5 inches in diameter and 1|2 inch # thick. A heaped bushel includes the # contents of this cylinder plus a heap # on top. The heap is a cone 19.5 # inches in diameter and 6 inches # high. With these values, the volume # of the bushel is 684.5 pi in^3 and # the heap occupies 190.125 pi in^3. # Therefore, the heaped bushel is # 874.625|684.5 bushels. This value is # approximately 1.2777575 and it rounds # to the value listed for the size of # the heaped bushel. Sometimes the # heaped bushel is reported as 1.25 # bushels. This same explanation gives # that value if the heap is taken to # have an 18.5 inch diameter. !endcategory !category us_grain "US Grain Measures" # Grain measures. The bushel as it is used by farmers in the USA is actually # a measure of mass which varies for different commodities. Canada uses the # same bushel masses for most commodities, but not for oats. wheatbushel 60 lb soybeanbushel 60 lb cornbushel 56 lb ryebushel 56 lb barleybushel 48 lb oatbushel 32 lb ricebushel 45 lb canada_oatbushel 34 lb !endcategory !category wine "Wine and Spirits Measures" # Wine and Spirits measure ponyvolume 1 usfloz jigger 1.5 usfloz # Can vary between 1 and 2 usfloz shot jigger # Sometimes 1 usfloz eushot 25 ml # EU standard spirits measure fifth 1|5 usgallon winebottle 750 ml # US industry standard, 1979 winesplit 1|4 winebottle wineglass 4 usfloz magnum 1.5 liter # Standardized in 1979, but given # as 2 qt in some references metrictenth 375 ml metricfifth 750 ml metricquart 1 liter !endcategory !category br_bottles "British Bottle Sizes" # Old British bottle size reputedquart 1|6 brgallon reputedpint 1|2 reputedquart brwinebottle reputedquart # Very close to 1|5 winegallon !endcategory !category fr_bottle "French Champagne Bottle Sizes" # French champagne bottle sizes split 200 ml jeroboam 2 magnum rehoboam 3 magnum methuselah 4 magnum salmanazar 6 magnum balthazar 8 magnum nebuchadnezzar 10 magnum !endcategory !category water_hardness "Water Hardness Measures" # # Water is "hard" if it contains various minerals, expecially calcium # carbonate. # clarkdegree grains/brgallon # Content by weigh of calcium carbonate gpg grains/usgallon # Divide by water's density to convert to # a dimensionless concentration measure !endcategory !category shoes "Shoe Measures" # # Shoe measures # shoeiron 1|48 inch # Used to measure leather in soles shoeounce 1|64 inch # Used to measure non-sole shoe leather # USA shoe sizes. These express the length of the shoe or the length # of the "last", the form that the shoe is made on. But note that # this only captures the length. It appears that widths change 1/4 # inch for each letter within the same size, and if you change the # length by half a size then the width changes between 1/8 inch and # 1/4 inch. But this may not be standard. If you know better, please # contact me. shoesize_delta 1|3 inch # USA shoe sizes differ by this amount shoe_men0 8.25 inch shoe_women0 (7+11|12) inch shoe_boys0 (3+11|12) inch shoe_girls0 (3+7|12) inch #shoesize_men(n) units=[1;inch] shoe_men0 + n shoesize_delta ; \ # (shoesize_men+(-shoe_men0))/shoesize_delta #shoesize_women(n) units=[1;inch] shoe_women0 + n shoesize_delta ; \ # (shoesize_women+(-shoe_women0))/shoesize_delta #shoesize_boys(n) units=[1;inch] shoe_boys0 + n shoesize_delta ; \ # (shoesize_boys+(-shoe_boys0))/shoesize_delta #shoesize_girls(n) units=[1;inch] shoe_girls0 + n shoesize_delta ; \ # (shoesize_girls+(-shoe_girls0))/shoesize_delta # European shoe size. According to # http://www.shoeline.com/footnotes/shoeterm.shtml # shoe sizes in Europe are measured with Paris points which simply measure # the length of the shoe. europeshoesize 2|3 cm !endcategory !category usa_slang "USA Slang Units" # # USA slang units # key kg # usually of marijuana, 60's lid 1 oz # Another 60's weed unit footballfield usfootballfield usfootballfield 100 yards canadafootballfield 110 yards # And 65 yards wide marathon 26 miles + 385 yards !endcategory ############################################################################# # # # British units # # # ############################################################################# !category br_length "British Length Measures" # The length measure in the UK was defined by a bronze bar manufactured in # 1844. Various conversions were sanctioned for convenience at different # times, which makes conversions before 1963 a confusing matter. Apparently # previous conversions were never explicitly revoked. Four different # conversion factors appear below. Multiply them times an imperial length # units as desired. The Weights and Measures Act of 1963 switched the UK away # from their bronze standard and onto a definition of the yard in terms of the # meter. This happened after an international agreement in 1959 to align the # world's measurement systems. # In 1922, Seers, Jolly and # Johnson found the yard to be # 0.91439841 meters. # Used starting in the 1930's. UKSJJyard 0.91439841 meter UKSJJfoot 1|3 UKSJJyard UKSJJinch 1|12 UKSJJfoot UKSJJmile 5280 UKSJJfoot bryard UKSJJyard brfoot UKSJJfoot brinch UKSJJinch brmile UKSJJmile UKyard UKSJJyard UKfoot UKSJJfoot UKinch UKSJJinch UKmile UKSJJmile UKft UKfoot # Benoit found the yard to be # 0.9143992 m at a weights and # measures conference around # 1896. Legally sanctioned # in 1898. UKByard 0.9143992 meter UKBfoot 1|3 UKByard UKBinch 1|12 UKBfoot UKBmile 5280 UKBfoot # In 1866 Clarke found the meter # to be 1.09362311 yards. This # conversion was legalized # around 1878. UKCyard 1|1.09362311 meter UKCfoot 1|3 UKCyard UKCinch 1|12 UKCfoot UKCmile 5280 UKCfoot # In 1816 Kater found this ratio # for the meter and inch. This # value was used as the legal # conversion ratio when the # metric system was legalized # for contract in 1864. UKKinch 1|39.37079 meter UKKfoot 12 UKKinch UKKyard 3 UKKfoot UKKmile 5280 UKKfoot brnauticalmile 6080 ft # Used until 1970 when the UK brknot brnauticalmile / hr # switched to the international brcable 1|10 brnauticalmile # nautical mile. brstatutemile 5280 brfoot english_land_league 3 brmile brleague english_land_league admiraltymile brnauticalmile admiraltyknot brknot admiraltycable brcable seamile 6000 ft shackle 15 fathoms # Adopted 1949 by British navy !endcategory !category br_weight "British Weight Measures" # British Imperial weight is mostly the same as US weight. A few extra # units are added here. clove 7 lb stone 14 lb tod 28 lb brquarterweight 1|4 brhundredweight brhundredweight 8 stone longhundredweight brhundredweight longton 20 brhundredweight brton longton !endcategory !category br_volume "British Volume Measures" # British Imperial volume measures brminim 1|60 brdram brscruple 1|3 brdram fluidscruple brscruple brdram 1|8 brfloz brfluidounce 1|20 brpint brfloz brfluidounce brgill 1|4 brpint brpint 1|2 brquart brquart 1|4 brgallon brgallon 4.54609 l # The British Imperial gallon was # defined in 1824 to be the volume of # water which weighed 10 pounds at 62 # deg F with a pressure of 30 inHg. # It was also defined as 277.274 in^3, # Which is slightly in error. In # 1963 it was defined to be the volume # occupied by 10 pounds of distilled # water of density 0.998859 g/ml weighed # in air of density 0.001217 g/ml # against weights of density 8.136 g/ml. # This gives a value of approximately # 4.5459645 liters, but the old liter # was in force at this time. In 1976 # the definition was changed to exactly # 4.54609 liters using the new # definition of the liter (1 dm^3). brbarrel 36 brgallon # Used for beer brbushel 8 brgallon brheapedbushel 1.278 brbushel brquarter 8 brbushel brchaldron 36 brbushel # Obscure British volume measures. These units are generally traditional # measures whose definitions have fluctuated over the years. Often they # depended on the quantity being measured. They are given here in terms of # British Imperial measures. For example, the puncheon may have historically # been defined relative to the wine gallon or beer gallon or ale gallon # rather than the British Imperial gallon. bag 4 brbushel bucket 4 brgallon kilderkin 2 brfirkin last 40 brbushel noggin brgill pottle 0.5 brgallon pin 4.5 brgallon puncheon 72 brgallon seam 8 brbushel coomb 4 brbushel boll 6 brbushel firlot 1|4 boll brfirkin 9 brgallon # Used for ale and beer cran 37.5 brgallon # measures herring, about 750 fish brwinehogshead 52.5 brgallon # This value is approximately equal brhogshead brwinehogshead # to the old wine hogshead of 63 # wine gallons. This adjustment # is listed in the OED and in # "The Weights and Measures of # England" by R. D. Connor brbeerhogshead 54 brgallon brbeerbutt 2 brbeerhogshead registerton 100 ft^3 # Used for internal capacity of ships shippington 40 ft^3 # Used for ship's cargo freight or timber brshippington 42 ft^3 # freightton shippington # Both register ton and shipping ton derive # from the "tun cask" of wine. displacementton 35 ft^3 # Approximate volume of a longton weight of # sea water. Measures water displaced by # ships. waterton 224 brgallon strike 70.5 l # 16th century unit, sometimes # defined as .5, 2, or 4 bushels # depending on the location. It # probably doesn't make a lot of # sense to define in terms of imperial # bushels. Zupko gives a value of # 2 Winchester grain bushels or about # 70.5 liters. amber 4 brbushel# Used for dry and liquid capacity [18] # British volume measures with "imperial" imperialminim brminim imperialscruple brscruple imperialdram brdram imperialfluidounce brfluidounce imperialfloz brfloz imperialgill brgill imperialpint brpint imperialquart brquart imperialgallon brgallon imperialbarrel brbarrel imperialbushel brbushel imperialheapedbushel brheapedbushel imperialquarter brquarter imperialchaldron brchaldron imperialwinehogshead brwinehogshead imperialhogshead brhogshead imperialbeerhogshead brbeerhogshead imperialbeerbutt brbeerbutt imperialfirkin brfirkin !endcategory !category br_length "British Length Measures" # obscure # obscure British lengths barleycorn 1|3 UKinch # Given in Realm of Measure as the # difference between successive shoe sizes nail 1|16 UKyard # Originally the width of the thumbnail, # or 1|16 ft. This took on the general # meaning of 1|16 and settled on the # nail of a yard or 1|16 yards as its # final value. [12] brpole 16.5 UKft # This was 15 Saxon feet, the Saxon rope 20 UKft # foot (aka northern foot) being longer englishell 45 UKinch flemishell 27 UKinch ell englishell # supposed to be measure from elbow to # fingertips span 9 UKinch # supposed to be distance from thumb # to pinky with full hand extension goad 4.5 UKft # used for cloth, possibly named after the # stick used for prodding animals. !endcategory !category br_length "British Length Measures" # misc. obscure # misc obscure British units hide 120 acre # English unit of land area dating to the 7th # century, originally the amount of land # that a single plowman could cultivate, # which varied from 60-180 acres regionally. # Standardized at Normon conquest. virgate 1|4 hide nook 1|2 virgate rood furlong rod # Area of a strip a rod by a furlong englishcarat troyounce/151.5 # Originally intended to be 4 grain # but this value ended up being # used in the London diamond market mancus 2 oz mast 2.5 lb nailkeg 100 lbs basebox 31360 in^2 # Used in metal plating # alternate spellings metre meter gramme gram litre liter dioptre diopter !endcategory ############################################################################# # # # Misc. Customary units # # # ############################################################################# !category human_measures "Human Body Measurements" # # Units derived the human body (may not be very accurate) # geometricpace 5 ft # distance between points where the same # foot hits the ground pace 2.5 ft # distance between points where alternate # feet touch the ground USmilitarypace 30 in # United States official military pace USdoubletimepace 36 in # United States official doubletime pace fingerbreadth 7|8 in # The finger is defined as either the width fingerlength 4.5 in # or length of the finger finger fingerbreadth palmwidth hand # The palm is a unit defined as either the width palmlength 8 in # or the length of the hand hand 4 inch # width of hand shaftment 6 inch # Distance from tip of outstretched thumb to the # opposite side of the palm of the hand. The # ending -ment is from the old English word # for hand. [18] smoot 5 ft + 7 in # Created as part of an MIT fraternity prank. # In 1958 Oliver Smoot was used to measure # the length of the Harvard Bridge, which was # marked off in smooth lengths. These # markings have been maintained on the bridge # since then and repainted by subsequent # incoming fraternity members. During a # bridge rennovation the new sidewalk was # scored every smooth rather than at the # customary 6 ft spacing. !endcategory !category us_volume "US Volume Measures" # # Cooking measures # # Common abbreviations tbl tablespoon tbsp tablespoon tblsp tablespoon Tb tablespoon tsp teaspoon saltspoon 1|4 tsp # US measures uscup 8 usfloz ustablespoon 1|16 uscup usteaspoon 1|3 ustablespoon ustbl ustablespoon ustbsp ustablespoon ustblsp ustablespoon ustsp usteaspoon metriccup 250 ml stickbutter 1|4 lb # Butter in the USA is sold in one # pound packages that contain four # individually wrapped pieces. The # pieces are marked into tablespoons, # making it possible to measure out # butter by volume by slicing the # butter. legalcup 240 ml # The cup used on nutrition labeling legaltablespoon 1|16 legalcup legaltbsp legaltablespoon # Scoop size. Ice cream scoops in the US are marked with numbers # indicating the number of scoops requird to fill a US quart. #scoop(n) units=[1;cup] domain=[4,100] range=[0.04,1] \ # 32 usfloz / n ; 32 usfloz / scoop # US can sizes. number1can 10 usfloz number2can 19 usfloz number2.5can 3.5 uscups number3can 4 uscups number5can 7 uscups number10can 105 usfloz !endcategory !category br_volume "British Volume Measures" # British measures brcup 1|2 brpint brteacup 1|3 brpint brtablespoon 15 ml # Also 5|8 brfloz, approx 17.7 ml brteaspoon 1|3 brtablespoon # Also 1|4 brtablespoon brdessertspoon 2 brteaspoon dessertspoon brdessertspoon dsp dessertspoon brtsp brteaspoon brtbl brtablespoon brtbsp brtablespoon brtblsp brtablespoon !endcategory !category au_volume "Australian Volume Measures" # Australian australiatablespoon 20 ml austbl australiatablespoon austbsp australiatablespoon austblsp australiatablespoon australiateaspoon 1|4 australiatablespoon austsp australiateaspoon !endcategory !category italian "Italian Measures" # Italian etto 100 g # Used for buying items like meat and etti etto # cheese. !endcategory !category chinese "Chinese Measures" # Chinese catty 0.5 kg oldcatty 4|3 lbs # Before metric conversion. tael 1|16 oldcatty # Should the tael be defined both ways? mace 0.1 tael oldpicul 100 oldcatty picul 100 catty # Chinese usage !endcategory !category indian "Indian Measures" # Indian seer 14400 grain # British Colonial standard ser seer maund 40 seer pakistanseer 1 kg pakistanmaund 40 pakistanseer chittak 1|16 seer tola 1|5 chittak ollock 1|4 liter # Is this right? !endcategory !category japanese "Japanese Measures" # Japanese japancup 200 ml !endcategory !category density "Density Measures" # # Density measures. Density has traditionally been measured on a variety of # bizarre nonlinear scales. # # Density of a sugar syrup is frequently measured in candy making procedures. # In the USA the boiling point of the syrup is measured. Some recipes instead # specify the density using degrees Baume. Conversion between degrees Baume # and the boiling point measure has proved elusive. This table appeared in one # text, and provides a fragmentary relationship to the concentration. # # temp(C) conc (%) # 100 30 # 101 40 # 102 50 # 103 60 # 106 70 # 112 80 # 123 90 # 140 95 # 151 97 # 160 98.2 # 166 99.5 # 171 99.6 # # The best source identified to date came from "Boiling point elevation of # technical sugarcane solutions and its use in automatic pan boiling" by # Michael Saska. International Sugar Journal, 2002, 104, 1247, pp 500-507. # # But I'm using equation (3) which is credited to Starzak and Peacock, # "Water activity coefficient in aqueous solutions of sucrose--A comprehensive # data analyzis. Zuckerindustrie, 122, 380-387. (I couldn't find this # document.) # # Note that the range of validity is uncertain, but answers are in agreement # with the above table all the way to 99.6. # # The original equation has a parameter for the boiling point of water, which # of course varies with altitude. It also includes various other model # parameters. The input is the molar concentration of sucrose in the solution, # (moles sucrose) / (total moles). # # Bsp 3797.06 degC # Csp 226.28 degC # QQ -17638 J/mol # asp -1.0038 # bsp -0.24653 # tbw 100 degC # boiling point of water # sugar_bpe_orig(x) ((1-QQ/R Bsp * x^2 (1+asp x + bsp x^2) (tbw + Csp) \ # /(tbw+stdtemp)) / (1+(tbw + Csp)/Bsp *ln(1-x))-1) * (tbw + Csp) # # To convert mass concentration (brix) to molar concentration # # sc(x) (x / 342.3) / (( x/342.3) + (100-x)/18.02); \ # 100 sc 342.3|18.02 / (sc (342.3|18.02-1)+1) # # Here is a simplfied version of this equation where the temperature of boiling # water has been fixed at 100 degrees Celcius and the argument is now the # concentration (brix). # # sugar_bpe(x) ((1+ 0.48851085 * sc(x)^2 (1+ -1.0038 sc(x) + -0.24653 sc(x)^2)) \ # / (1+0.08592964 ln(1-sc(x)))-1) 326.28 K # # # The formula is not invertible, so to implement it in units we unfortunately # must turn it into a table. # This table gives the boiling point elevation as a function of the sugar syrup # concentration expressed as a percentage. #sugar_conc_bpe[K] \ # 0 0.0000 5 0.0788 10 0.1690 15 0.2729 20 0.3936 25 0.5351 \ #30 0.7027 35 0.9036 40 1.1475 42 1.2599 44 1.3825 46 1.5165 \ #48 1.6634 50 1.8249 52 2.0031 54 2.2005 56 2.4200 58 2.6651 \ #60 2.9400 61 3.0902 62 3.2499 63 3.4198 64 3.6010 65 3.7944 \ #66 4.0012 67 4.2227 68 4.4603 69 4.7156 70 4.9905 71 5.2870 \ #72 5.6075 73 5.9546 74 6.3316 75 6.7417 76 7.1892 77 7.6786 \ #78.0 8.2155 79.0 8.8061 80.0 9.4578 80.5 9.8092 81.0 10.1793 \ #81.5 10.5693 82.0 10.9807 82.5 11.4152 83.0 11.8743 83.5 12.3601 \ #84.0 12.8744 84.5 13.4197 85.0 13.9982 85.5 14.6128 86.0 15.2663 \ #86.5 15.9620 87.0 16.7033 87.5 17.4943 88.0 18.3391 88.5 19.2424 \ #89.0 20.2092 89.5 21.2452 90.0 22.3564 90.5 23.5493 91.0 24.8309 \ #91.5 26.2086 92.0 27.6903 92.5 29.2839 93.0 30.9972 93.5 32.8374 \ #94.0 34.8104 94.5 36.9195 95.0 39.1636 95.5 41.5348 96.0 44.0142 \ #96.5 46.5668 97.0 49.1350 97.5 51.6347 98.0 53.9681 98.1 54.4091 \ #98.2 54.8423 98.3 55.2692 98.4 55.6928 98.5 56.1174 98.6 56.5497 \ #98.7 56.9999 98.8 57.4828 98.9 58.0206 99.0 58.6455 99.1 59.4062 \ #99.2 60.3763 99.3 61.6706 99.4 63.4751 99.5 66.1062 99.6 70.1448 \ #99.7 76.7867 # Using the brix table we can use this to produce a mapping from boiling point # to density which makes all of the units interconvertible. Because the brix # table stops at 95 this approach works up to a boiling point elevation of 39 K # or a boiling point of 139 C / 282 F, which is the "soft crack" stage in candy # making. The "hard crack" stage continues up to 310 F. # Boiling point elevation #sugar_bpe(T) units=[K;g/cm^3] domain=[0,39.1636] range=[0.99717,1.5144619] \ # brix(~sugar_conc_bpe(T)); sugar_conc_bpe(~brix(sugar_bpe)) # Absolute boiling point (produces an absolute temperature) #sugar_bp(T) units=[K;g/cm^3] domain=[373.15,412.3136] \ # range=[0.99717,1.5144619] \ # brix(~sugar_conc_bpe(T-tempC(100))) ;\ # sugar_conc_bpe(~brix(sugar_bp))+tempC(100) # In practice dealing with the absolute temperature is annoying because it is # not possible to convert to a nested function, so you're stuck retyping the # absolute temperature in Kelvins to convert to celsius or Fahrenheit. To # prevent this we supply definitions that build in the temperature conversion # and produce results in the Fahrenheit and Celcius scales. So using these # measures, to convert 46 degrees Baume to a Fahrenheit boiling point: # # You have: baume(45) # You want: sugar_bpF # 239.05647 # #sugar_bpF(T) units=[1;g/cm^3] domain=[212,282.49448] range=[0.99717,1.5144619]\ # brix(~sugar_conc_bpe(tempF(T)+-tempC(100))) ;\ # ~tempF(sugar_conc_bpe(~brix(sugar_bpF))+tempC(100)) #sugar_bpC(T) units=[1;g/cm^3] domain=[100,139.1636] range=[0.99717,1.5144619]\ # brix(~sugar_conc_bpe(tempC(T)+-tempC(100))) ;\ # ~tempC(sugar_conc_bpe(~brix(sugar_bpC))+tempC(100)) # Degrees Baume is used in European recipes to specify the density of a sugar # syrup. An entirely different definition is used for densities below # 1 g/cm^3. An arbitrary constant appears in the definition. This value is # equal to 145 in the US, but was according to [], the old scale used in # Holland had a value of 144, and the new scale or Gerlach scale used 146.78. baumeconst 145 # US value #baume(d) units=[1;g/cm^3] domain=[0,145) range=[1,) \ # (baumeconst/(baumeconst+-d)) g/cm^3 ; \ # (baume+((-g)/cm^3)) baumeconst / baume # It's not clear if this value was ever used with negative degrees. #twaddell(x) units=[1;g/cm^3] domain=[-200,) range=[0,) \ # (1 + 0.005 x) g / cm^3 ; \ # 200 (twaddell / (g/cm^3) +- 1) # The degree quevenne is a unit for measuring the density of milk. # Similarly it's unclear if negative values were allowed here. #quevenne(x) units=[1;g/cm^3] domain=[-1000,) range=[0,) \ # (1 + 0.001 x) g / cm^3 ; \ # 1000 (quevenne / (g/cm^3) +- 1) # Degrees brix measures sugar concentration by weigh as a percentage, so a # solution that is 3 degrees brix is 3% sugar by weight. This unit was named # after Adolf Brix who invented a hydrometer that read this percentage # directly. This data is from Table 114 of NIST Circular 440, "Polarimetry, # Saccharimetry and the Sugars". It gives apparent specific gravity at 20 # degrees Celsius of various sugar concentrations. As rendered below this # data is converted to apparent density at 20 degrees Celsius using the # density figure for water given in the same NIST reference. They use the # word "apparent" to refer to measurements being made in air with brass # weights rather than vacuum. #brix[0.99717g/cm^3]\ # 0 1.00000 1 1.00390 2 1.00780 3 1.01173 4 1.01569 5 1.01968 \ # 6 1.02369 7 1.02773 8 1.03180 9 1.03590 10 1.04003 11 1.04418 \ # 12 1.04837 13 1.05259 14 1.05683 15 1.06111 16 1.06542 17 1.06976 \ # 18 1.07413 19 1.07853 20 1.08297 21 1.08744 22 1.09194 23 1.09647 \ # 24 1.10104 25 1.10564 26 1.11027 27 1.11493 28 1.11963 29 1.12436 \ # 30 1.12913 31 1.13394 32 1.13877 33 1.14364 34 1.14855 35 1.15350 \ # 36 1.15847 37 1.16349 38 1.16853 39 1.17362 40 1.17874 41 1.18390 \ # 42 1.18910 43 1.19434 44 1.19961 45 1.20491 46 1.21026 47 1.21564 \ # 48 1.22106 49 1.22652 50 1.23202 51 1.23756 52 1.24313 53 1.24874 \ # 54 1.25439 55 1.26007 56 1.26580 57 1.27156 58 1.27736 59 1.28320 \ # 60 1.28909 61 1.29498 62 1.30093 63 1.30694 64 1.31297 65 1.31905 \ # 66 1.32516 67 1.33129 68 1.33748 69 1.34371 70 1.34997 71 1.35627 \ # 72 1.36261 73 1.36900 74 1.37541 75 1.38187 76 1.38835 77 1.39489 \ # 78 1.40146 79 1.40806 80 1.41471 81 1.42138 82 1.42810 83 1.43486 \ # 84 1.44165 85 1.44848 86 1.45535 87 1.46225 88 1.46919 89 1.47616 \ # 90 1.48317 91 1.49022 92 1.49730 93 1.50442 94 1.51157 95 1.51876 # Density measure invented by the American Petroleum Institute. Lighter # petroleum products are more valuable, and they get a higher API degree. # # The intervals of range and domain should be open rather than closed. # #apidegree(x) units=[1;g/cm^3] domain=[-131.5,) range=[0,) \ # 141.5 g/cm^3 / (x+131.5) ; \ # 141.5 (g/cm^3) / apidegree + (-131.5) !endcategory !category derived_customary "Derived Customary Units" # # Units derived from imperial system # ouncedal oz ft / s^2 # force which accelerates an ounce # at 1 ft/s^2 poundal lb ft / s^2 # same thing for a pound tondal longton ft / s^2 # and for a ton pdl poundal osi ounce force / inch^2 # used in aviation psi pound force / inch^2 psia psi # absolute pressure # Note that gauge pressure can be given # using the gaugepressure() and # psig() nonlinear unit definitions tsi ton force / inch^2 reyn psi sec slug lbf s^2 / ft slugf slug force slinch lbf s^2 / inch # Mass unit derived from inch second slinchf slinch force # pound-force system. Used in space # applications where in/sec^2 was a # natural acceleration measure. geepound slug lbf lb force tonf ton force lbm lb kip 1000 lbf # from kilopound ksi kip / in^2 mil 0.001 inch thou 0.001 inch tenth 0.0001 inch # one tenth of one thousandth of an inch millionth 1e-6 inch # one millionth of an inch circularinch 1|4 pi in^2 # area of a one-inch diameter circle circleinch circularinch # A circle with diameter d inches has # an area of d^2 circularinches cylinderinch circleinch inch # Cylinder h inch tall, d inches diameter # has volume d^2 h cylinder inches circularmil 1|4 pi mil^2 # area of one-mil diameter circle cmil circularmil cental 100 pound centner cental caliber 0.01 inch # for measuring bullets duty ft lbf celo ft / s^2 jerk ft / s^3 australiapoint 0.01 inch # The "point" is used to measure rainfall # in Australia sabin ft^2 # Measure of sound absorption equal to the # absorbing power of one square foot of # a perfectly absorbing material. The # sound absorptivity of an object is the # area times a dimensionless # absorptivity coefficient. standardgauge 4 ft + 8.5 in # Standard width between railroad track flag 5 ft^2 # Construction term referring to sidewalk. rollwallpaper 30 ft^2 # Area of roll of wall paper fillpower in^3 / ounce # Density of down at standard pressure. # The best down has 750-800 fillpower. pinlength 1|16 inch # A #17 pin is 17/16 in long in the USA. buttonline 1|40 inch # The line was used in 19th century USA # to measure width of buttons. beespace 1|4 inch # Bees will fill any space that is smaller # than the bee space and leave open # spaces that are larger. The size of # the space varies with species. tapediamond 8|5 ft # Marking on US tape measures that is # useful to carpenters who wish to place # five studs in an 8 ft distance. Note # that the numbers appear in red every # 16 inches as well, giving six # divisions in 8 feet. retmaunit 1.75 in # Height of rack mountable equipment. U retmaunit # Equipment should be 1|32 inch narrower RU U # than its U measurement indicates to # allow for clearance, so 4U=(6+31|32)in # RETMA stands for the former name of # the standardizing organization, Radio # Electronics Television Manufacturers # Association. This organization is now # called the Electronic Industries # Alliance (EIA) and the rack standard # is specified in EIA RS-310-D. count /pound # For measuring the size of shrimp !endcategory !category calories "Calories" # Calories: energy to raise a gram of water one degree celsius cal_IT 4.1868 J # International Table calorie cal_th 4.184 J # Thermochemical calorie cal_fifteen 4.18580 J # Energy to go from 14.5 to 15.5 degC cal_twenty 4.18190 J # Energy to go from 19.5 to 20.5 degC cal_mean 4.19002 J # 1|100 energy to go from 0 to 100 degC calorie cal_IT cal calorie calorie_IT cal_IT thermcalorie cal_th calorie_th thermcalorie Calorie kilocalorie # the food Calorie thermie 1e6 cal_fifteen # Heat required to raise the # temperature of a tonne of # water from 14.5 to 15.5 degC. !endcategory !category thermal "Thermal Units" # btu definitions: energy to raise a pound of water 1 degF btu cal lb degR / gram K # international table BTU britishthermalunit btu btu_IT btu btu_th cal_th lb degR / gram K btu_mean cal_mean lb degR / gram K quad quadrillion btu ECtherm 1.05506e8 J # Exact definition, close to 1e5 btu UStherm 1.054804e8 J # Exact definition therm UStherm # Celsius heat unit: energy to raise a pound of water 1 degC celsiusheatunit cal lb K / gram K chu celsiusheatunit !endcategory !category electrical "Electrical Units" # "Apparent" average power in an AC circuit, the product of rms voltage # and rms current, equal to the true power in watts when voltage and # current are in phase. In a DC circuit, always equal to the true power. VA volt ampere kWh kilowatt hour !endcategory !category horses "Horse Units" # The horsepower is supposedly the power of one horse pulling. Obviously # different people had different horses. horsepower 550 foot pound force / sec # Invented by James Watt mechanicalhorsepower horsepower hp horsepower metrichorsepower 75 kilogram force meter / sec # PS=Pferdestaerke in electrichorsepower 746 W # Germany boilerhorsepower 9809.50 W waterhorsepower 746.043 W brhorsepower 745.70 W donkeypower 250 W chevalvapeur metrichorsepower !endcategory !category heat_transfer "Heat Transfer Measures" # # Heat Transfer # # Thermal conductivity, K, measures the rate of heat transfer across # a material. The heat transfered is # Q = K dT A t / L # where dT is the temperature difference across the material, A is the # cross sectional area, t is the time, and L is the length (thickness). # Thermal conductivity is a material property. thermal_resistivity ? 1/thermal_conductivity # Thermal conductance is the rate at which heat flows across a given # object, so the area and thickness have been fixed. It depends on # the size of the object and is hence not a material property. thermal_conductance ? power / temperature thermal_resistance ? 1/thermal_conductance # Thermal admittance is the rate of heat flow per area across an # object whose thickness has been fixed. Its reciprocal, thermal # insulation, is used to for measuring the heat transfer per area # of sheets of insulation or cloth that are of specified thickness. thermal_admittance ? thermal_conductivity / length # thermal_insulance thermal_resistivity length thermal_insulation ? thermal_resistivity length Rvalue degR ft^2 hr / btu Uvalue 1/Rvalue europeanUvalue watt / m^2 K RSI K m^2 / W clo 0.155 K m^2 / W # Supposed to be the insulance # required to keep a resting person # comfortable indoors. The value # given is from NIST and the CRC, # but [5] gives a slightly different # value of 0.875 ft^2 degF hr / btu. tog 0.1 K m^2 / W # Also used for clothing. !endcategory !category bel "Decibel" # The bel was defined by engineers of Bell Laboratories to describe the # reduction in audio level over a length of one mile. It was originally # called the transmission unit (TU) but was renamed around 1923 to honor # Alexander Graham Bell. The bel proved inconveniently large so the decibel # has become more common. The decibel is dimensionless since it reports a # ratio, but it is used in various contexts to report a signal's power # relative to some reference level. #bel(x) units=[1;1] range=(0,) 10^(x); log(bel) # Basic bel definition #decibel(x) units=[1;1] range=(0,) 10^(x/10); 10 log(decibel) # Basic decibel #dB() decibel # Abbreviation #dBW(x) units=[1;W] range=(0,) dB(x) W ; ~dB(dBW/W) # Reference = 1 W #dBk(x) units=[1;W] range=(0,) dB(x) kW ; ~dB(dBk/kW) # Reference = 1 kW #dBf(x) units=[1;W] range=(0,) dB(x) fW ; ~dB(dBf/fW) # Reference = 1 fW #dBm(x) units=[1;W] range=(0,) dB(x) mW ; ~dB(dBm/mW) # Reference = 1 mW #dBmW(x) units=[1;W] range=(0,) dBm(x) ; ~dBm(dBmW) # Reference = 1 mW #dBJ(x) units=[1;J] range=(0,) dB(x) J; ~dB(dBJ/J) # Energy relative # to 1 joule. Used for power spectral # density since W/Hz = J # When used to measure amplitude, voltage, or current the signal is squared # because power is proportional to the square of these measures. The root # mean square (RMS) voltage is typically used with these units. #dBV(x) units=[1;V] range=(0,) dB(0.5 x) V;~dB(dBV^2 / V^2) # Reference = 1 V #dBmV(x) units=[1;V] range=(0,) dB(0.5 x) mV;~dB(dBmV^2/mV^2)# Reference = 1 mV #dBuV(x) units=[1;V] range=(0,) dB(0.5 x) microV ; ~dB(dBuV^2 / microV^2) # Reference = 1 microvolt # Referenced to the voltage that causes 1 mW dissipation in a 600 ohm load. # Originally defined as dBv but changed to prevent confusion with dBV. # The "u" is for unloaded. #dBu(x) units=[1;V] range=(0,) dB(0.5 x) sqrt(mW 600 ohm) ; \ # ~dB(dBu^2 / mW 600 ohm) #dBv(x) units=[1;V] range=(0,) dBu(x) ; ~dBu(dBv) # Synonym for dBu # Measurements for sound in air, referenced to the threshold of human hearing # Note that sound in other media typically uses 1 micropascal as a reference # for sound pressure. Units dBA, dBB, dBC, refer to different frequency # weightings meant to approximate the human ear's response. #dBSPL(x) units=[1;Pa] range=(0,) dB(0.5 x) 20 microPa ; \ # ~dB(dBSPL^2 / (20 microPa)^2) # pressure #dBSIL(x) units=[1;W/m^2] range=(0,) dB(x) 1e-12 W/m^2; \ # ~dB(dBSIL / (1e-12 W/m^2)) # intensity #dBSWL(x) units=[1;W] range=(0,) dB(x) 1e-12 W; ~dB(dBSWL/1e-12 W) !endcategory !category misc_other "Misc. other measures" # Misc other measures clausius 1e3 cal/K # A unit of physical entropy langley thermcalorie/cm^2 # Used in radiation theory poncelet 100 kg force m / s tonrefrigeration uston 144 btu / lb day # One ton refrigeration is # the rate of heat extraction required # turn one ton of water to ice in # a day. Ice is defined to have a # latent heat of 144 btu/lb. tonref tonrefrigeration refrigeration tonref / ton frigorie 1000 cal_fifteen# Used in refrigeration engineering. tnt 1e9 cal_th / ton# So you can write tons tnt. This # is a defined, not measured, value. airwatt 8.5 (ft^3/min) inH2O # Measure of vacuum power as # pressure times air flow. !endcategory !category permeability "Permeability Measures" # # Permeability: The permeability or permeance, n, of a substance determines # how fast vapor flows through the substance. The formula W = n A dP # holds where W is the rate of flow (in mass/time), n is the permeability, # A is the area of the flow path, and dP is the vapor pressure difference. # perm_0C grain / hr ft^2 inHg perm_zero perm_0C perm_0 perm_0C perm perm_0C perm_23C grain / hr ft^2 in pressure_column_23C of Hg perm_twentythree perm_23C !endcategory !category counting "Counting measures" # # Counting measures # pair 2 brace 2 nest 3 # often used for items like bowls that # nest together hattrick 3 # Used in sports, especially cricket and ice # hockey to report the number of goals. dicker 10 dozen 12 bakersdozen 13 score 20 flock 40 timer 40 shock 60 toncount 100 # Used in sports in the UK longhundred 120 # From a germanic counting system gross 144 greatgross 12 gross tithe 1|10 # From Anglo-Saxon word for tenth # Paper counting measure shortquire 24 quire 25 shortream 480 ream 500 perfectream 516 bundle 2 reams bale 5 bundles !endcategory !category paper "Paper Sizes" # # Paper measures # # USA paper sizes lettersize 8.5 inch 11 inch legalsize 8.5 inch 14 inch ledgersize 11 inch 17 inch executivesize 7.25 inch 10.5 inch Apaper 8.5 inch 11 inch Bpaper 11 inch 17 inch Cpaper 17 inch 22 inch Dpaper 22 inch 34 inch Epaper 34 inch 44 inch # Correspondence envelope sizes. #10 is the standard business # envelope in the USA. envelope6_25size 3.5 inch 6 inch envelope6_75size 3.625 inch 6.5 inch envelope7size 3.75 inch 6.75 inch envelope7_75size 3.875 inch 7.5 inch envelope8_625size 3.625 inch 8.625 inch envelope9size 3.875 inch 8.875 inch envelope10size 4.125 inch 9.5 inch envelope11size 4.5 inch 10.375 inch envelope12size 4.75 inch 11 inch envelope14size 5 inch 11.5 inch envelope16size 6 inch 12 inch # Announcement envelope sizes (no relation to metric paper sizes like A4) envelopeA1size 3.625 inch 5.125 inch # same as 4bar envelopeA2size 4.375 inch 5.75 inch envelopeA6size 4.75 inch 6.5 inch envelopeA7size 5.25 inch 7.25 inch envelopeA8size 5.5 inch 8.125 inch envelopeA9size 5.75 inch 8.75 inch envelopeA10size 6 inch 9.5 inch # Baronial envelopes envelope4bar 3.625 inch 5.125 inch # same as A1 envelope5_5bar 4.375 inch 5.75 inch envelope6bar 4.75 inch 6.5 inch # Coin envelopes envelope1baby 2.25 inch 3.5 inch # same as #1 coin envelope00coin 1.6875 inch 2.75 inch envelope1coin 2.25 inch 3.5 inch envelope3coin 2.5 inch 4.25 inch envelope4coin 3 inch 4.5 inch envelope4_5coin 3 inch 4.875 inch envelope5coin 2.875 inch 5.25 inch envelope5_5coin 3.125 inch 5.5 inch envelope6coin 3.375 inch 6 inch envelope7coin 3.5 inch 6.5 inch # The metric paper sizes are defined so that if a sheet is cut in half # along the short direction, the result is two sheets which are # similar to the original sheet. This means that for any metric size, # the long side is close to sqrt(2) times the length of the short # side. Each series of sizes is generated by repeated cuts in half, # with the values rounded down to the nearest millimeter. A0paper 841 mm 1189 mm # The basic size in the A series A1paper 594 mm 841 mm # is defined to have an area of A2paper 420 mm 594 mm # one square meter. A3paper 297 mm 420 mm A4paper 210 mm 297 mm A5paper 148 mm 210 mm A6paper 105 mm 148 mm A7paper 74 mm 105 mm A8paper 52 mm 74 mm A9paper 37 mm 52 mm A10paper 26 mm 37 mm B0paper 1000 mm 1414 mm # The basic B size has an area B1paper 707 mm 1000 mm # of sqrt(2) square meters. B2paper 500 mm 707 mm B3paper 353 mm 500 mm B4paper 250 mm 353 mm B5paper 176 mm 250 mm B6paper 125 mm 176 mm B7paper 88 mm 125 mm B8paper 62 mm 88 mm B9paper 44 mm 62 mm B10paper 31 mm 44 mm C0paper 917 mm 1297 mm # The basic C size has an area C1paper 648 mm 917 mm # of sqrt(sqrt(2)) square meters. C2paper 458 mm 648 mm C3paper 324 mm 458 mm # Intended for envelope sizes C4paper 229 mm 324 mm C5paper 162 mm 229 mm C6paper 114 mm 162 mm C7paper 81 mm 114 mm C8paper 57 mm 81 mm C9paper 40 mm 57 mm C10paper 28 mm 40 mm # gsm (Grams per Square Meter), a sane, metric paper weight measure gsm grams / meter^2 # In the USA, a collection of crazy historical paper measures are used. Paper # is measured as a weight of a ream of that particular type of paper. This is # sometimes called the "substance" or "basis" (as in "substance 20" paper). # The standard sheet size or "basis size" varies depending on the type of # paper. As a result, 20 pound bond paper and 50 pound text paper are actually # about the same weight. The different sheet sizes were historically the most # convenient for printing or folding in the different applications. These # different basis weights are standards maintained by American Society for # Testing Materials (ASTM) and the American Forest and Paper Association # (AF&PA). poundbookpaper lb / 25 inch 38 inch ream lbbook poundbookpaper poundtextpaper poundbookpaper lbtext poundtextpaper poundoffsetpaper poundbookpaper # For offset printing lboffset poundoffsetpaper poundbiblepaper poundbookpaper # Designed to be lightweight, thin, lbbible poundbiblepaper # strong and opaque. poundtagpaper lb / 24 inch 36 inch ream lbtag poundtagpaper poundbagpaper poundtagpaper lbbag poundbagpaper poundnewsprintpaper poundtagpaper lbnewsprint poundnewsprintpaper poundposterpaper poundtagpaper lbposter poundposterpaper poundtissuepaper poundtagpaper lbtissue poundtissuepaper poundwrappingpaper poundtagpaper lbwrapping poundwrappingpaper poundwaxingpaper poundtagpaper lbwaxing poundwaxingpaper poundglassinepaper poundtagpaper lbglassine poundglassinepaper poundcoverpaper lb / 20 inch 26 inch ream lbcover poundcoverpaper poundindexpaper lb / 25.5 inch 30.5 inch ream lbindex poundindexpaper poundindexbristolpaper poundindexpaper lbindexbristol poundindexpaper poundbondpaper lb / 17 inch 22 inch ream # Bond paper is stiff and lbbond poundbondpaper # durable for repeated poundwritingpaper poundbondpaper # filing, and it resists lbwriting poundwritingpaper # ink penetration. poundledgerpaper poundbondpaper lbledger poundledgerpaper poundcopypaper poundbondpaper lbcopy poundcopypaper poundblottingpaper lb / 19 inch 24 inch ream lbblotting poundblottingpaper poundblankspaper lb / 22 inch 28 inch ream lbblanks poundblankspaper poundpostcardpaper lb / 22.5 inch 28.5 inch ream lbpostcard poundpostcardpaper poundweddingbristol poundpostcardpaper lbweddingbristol poundweddingbristol poundbristolpaper poundweddingbristol lbbristol poundbristolpaper poundboxboard lb / 1000 ft^2 lbboxboard poundboxboard poundpaperboard poundboxboard lbpaperboard poundpaperboard # When paper is marked in units of M, it means the weight of 1000 sheets of the # given size of paper. To convert this to paper weight, divide by the size of # the paper in question. paperM lb / 1000 # In addition paper weight is reported in "caliper" which is simply the # thickness of one sheet, typically in inches. Thickness is also reported in # "points" where a point is 1|1000 inch. These conversions are supplied to # convert these units roughly (using an approximate density) into the standard # paper weight values. pointthickness 0.001 in paperdensity 0.8 g/cm^3 # approximate--paper densities vary! papercaliper in paperdensity paperpoint pointthickness paperdensity !endcategory !category printing "Printing Units" # # Printing # fournierpoint 0.1648 inch / 12 # First definition of the printers # point made by Pierre Fournier who # defined it in 1737 as 1|12 of a # cicero which was 0.1648 inches. olddidotpoint 1|72 frenchinch # François Ambroise Didot, one of # a family of printers, changed # Fournier's definition around 1770 # to fit to the French units then in # use. bertholdpoint 1|2660 m # H. Berthold tried to create a # metric version of the didot point # in 1878. INpoint 0.4 mm # This point was created by a # group directed by Fermin Didot in # 1881 and is associated with the # imprimerie nationale. It doesn't # seem to have been used much. germandidotpoint 0.376065 mm # Exact definition appears in DIN # 16507, a German standards document # of 1954. Adopted more broadly in # 1966 by ??? metricpoint 3|8 mm # Proposed in 1977 by Eurograf oldpoint 1|72.27 inch # The American point was invented printerspoint oldpoint # by Nelson Hawks in 1879 and texpoint oldpoint # dominates USA publishing. # It was standardized by the American # Typefounders Association at the # value of 0.013837 inches exactly. # Knuth uses the approximation given # here (which is very close). The # comp.fonts FAQ claims that this # value is supposed to be 1|12 of a # pica where 83 picas is equal to 35 # cm. But this value differs from # the standard. texscaledpoint 1|65536 texpoint # The TeX typesetting system uses texsp texscaledpoint # this for all computations. computerpoint 1|72 inch # The American point was rounded point computerpoint computerpica 12 computerpoint # to an even 1|72 inch by computer postscriptpoint computerpoint # people at some point. pspoint postscriptpoint twip 1|20 point # TWentieth of an Imperial Point Q 1|4 mm # Used in Japanese phototypesetting # Q is for quarter frenchprinterspoint olddidotpoint didotpoint germandidotpoint # This seems to be the dominant value europeanpoint didotpoint # for the point used in Europe cicero 12 didotpoint stick 2 inches # Type sizes excelsior 3 oldpoint brilliant 3.5 oldpoint diamondtype 4 oldpoint pearl 5 oldpoint agate 5.5 oldpoint # Originally agate type was 14 lines per # inch, giving a value of 1|14 in. ruby agate # British nonpareil 6 oldpoint mignonette 6.5 oldpoint emerald mignonette # British minion 7 oldpoint brevier 8 oldpoint bourgeois 9 oldpoint longprimer 10 oldpoint smallpica 11 oldpoint pica 12 oldpoint english 14 oldpoint columbian 16 oldpoint greatprimer 18 oldpoint paragon 20 oldpoint meridian 44 oldpoint canon 48 oldpoint # German type sizes nonplusultra 2 didotpoint brillant 3 didotpoint diamant 4 didotpoint perl 5 didotpoint nonpareille 6 didotpoint kolonel 7 didotpoint petit 8 didotpoint borgis 9 didotpoint korpus 10 didotpoint corpus korpus garamond korpus mittel 14 didotpoint tertia 16 didotpoint text 18 didotpoint kleine_kanon 32 didotpoint kanon 36 didotpoint grobe_kanon 42 didotpoint missal 48 didotpoint kleine_sabon 72 didotpoint grobe_sabon 84 didotpoint !endcategory !category computing "Computing Units" # # Information theory units. Note that the name "entropy" is used both # to measure information and as a physical quantity. # information ? bit #nat (1/ln(2)) bits # Entropy measured base e #hartley log2(10) bits # Entropy of a uniformly #ban hartley # distributed random variable # over 10 symbols. #dit hartley # from Decimal digIT # # Computer # b bit bps bit/sec # Sometimes the term "baud" is # incorrectly used to refer to # bits per second. Baud refers # to symbols per second. Modern # modems transmit several bits # per symbol. Kbps kbps # Irregular prefixes mbps Mbps gbps Gbps byte 8 bit # Not all machines had 8 bit B byte # bytes, but these days most of # them do. But beware: for # transmission over modems, a # few extra bits are used so # there are actually 10 bits per # byte. KB kB # Irregular prefix octet 8 bits # The octet is always 8 bits nybble 4 bits # Half of a byte. Sometimes # equal to different lengths # such as 3 bits. nibble nybble nyp 2 bits # Donald Knuth asks in an exercise # for a name for a 2 bit # quantity and gives the "nyp" # as a solution due to Gregor # Purdy. Not in common use. meg megabyte # Some people consider these # units along with the kilobyte gig gigabyte # to be defined according to # powers of 2 with the kilobyte # equal to 2^10 bytes, the # megabyte equal to 2^20 bytes and # the gigabyte equal to 2^30 bytes # but these usages are forbidden # by SI. Binary prefixes have # been defined by IEC to replace # the SI prefixes. Use them to # get the binary values: KiB, MiB, # and GiB. jiffy 0.01 sec # This is defined in the Jargon File jiffies jiffy # (http://www.jargon.org) as being the # duration of a clock tick for measuring # wall-clock time. Supposedly the value # used to be 1|60 sec or 1|50 sec # depending on the frequency of AC power, # but then 1|100 sec became more common. # On linux systems, this term is used and # for the Intel based chips, it does have # the value of .01 sec. The Jargon File # also lists two other definitions: # millisecond, and the time taken for # light to travel one foot. cdaudiospeed 44.1 kHz 2*16 bits # CD audio data rate at 44.1 kHz with 2 # samples of sixteen bits each. cdromspeed 75 2048 bytes / sec # For data CDs (mode1) 75 sectors are read # each second with 2048 bytes per sector. # Audio CDs do not have sectors, but # people sometimes divide the bit rate by # 75 and claim a sector length of 2352. # Data CDs have a lower rate due to # increased error correction overhead. # There is a rarely used mode (mode2) with # 2336 bytes per sector that has fewer # error correction bits than mode1. dvdspeed 1385 kB/s # This is the "1x" speed of a DVD using # constant linear velocity (CLV) mode. # Modern DVDs may vary the linear velocity # as they go from the inside to the # outside of the disc. # See http://www.osta.org/technology/dvdqa/dvdqa4.htm !endcategory !category music "Musical Measures" # # Musical measures. Musical intervals expressed as ratios. Multiply # two intervals together to get the sum of the interval. The function # musicalcent can be used to convert ratios to cents. # # Perfect intervals octave 2 majorsecond musicalfifth^2 / octave majorthird 5|4 minorthird 6|5 musicalfourth 4|3 musicalfifth 3|2 majorsixth musicalfourth majorthird minorsixth musicalfourth minorthird majorseventh musicalfifth majorthird minorseventh musicalfifth minorthird pythagoreanthird majorsecond musicalfifth^2 / octave syntoniccomma pythagoreanthird / majorthird pythagoreancomma musicalfifth^12 / octave^7 # Equal tempered definitions semitone octave^(1|12) #musicalcent(x) units=[1;1] range=(0,) semitone^(x/100) ; \ # 100 log(musicalcent)/log(semitone) # # Musical note lengths. # wholenote ! musical_note_length ? wholenote halfnote 1|2 wholenote quarternote 1|4 wholenote eighthnote 1|8 wholenote sixteenthnote 1|16 wholenote thirtysecondnote 1|32 wholenote sixtyfourthnote 1|64 wholenote dotted 3|2 doubledotted 7|4 breve doublewholenote semibreve wholenote minimnote halfnote crotchet quarternote quaver eighthnote semiquaver sixteenthnote demisemiquaver thirtysecondnote hemidemisemiquaver sixtyfourthnote semidemisemiquaver hemidemisemiquaver !endcategory !category cloth "Yarn and Cloth Measures" # # yarn and cloth measures # # yarn linear density woolyarnrun 1600 yard/pound # 1600 yds of "number 1 yarn" weighs # a pound. yarncut 300 yard/pound # Less common system used in # Pennsylvania for wool yarn cottonyarncount 840 yard/pound linenyarncount 300 yard/pound # Also used for hemp and ramie worstedyarncount 1680 ft/pound metricyarncount meter/gram denier 1|9 tex # used for silk and rayon manchesteryarnnumber drams/1000 yards # old system used for silk pli lb/in typp 1000 yd/lb # abbreviation for Thousand Yard Per Pound asbestoscut 100 yd/lb # used for glass and asbestos yarn tex gram / km # rational metric yarn measure, meant drex 0.1 tex # to be used for any kind of yarn poumar lb / 1e6 yard # yarn and cloth length skeincotton 80*54 inch # 80 turns of thread on a reel with a # 54 in circumference (varies for other # kinds of thread) cottonbolt 120 ft # cloth measurement woolbolt 210 ft bolt cottonbolt heer 600 yards cut 300 yards # used for wet-spun linen yarn lea 300 yards sailmakersyard 28.5 in sailmakersounce oz / sailmakersyard 36 inch silkmomme momme / 25 yards 1.49 inch # Traditional silk weight silkmm silkmomme # But it is also defined as # lb/100 yd 45 inch. The two # definitions are slightly different # and neither one seems likely to be # the true source definition. !endcategory !category dosage "Drug Dosage" # # drug dosage # mcg microgram # Frequently used for vitamins iudiptheria 62.8 microgram # IU is for international unit iupenicillin 0.6 microgram iuinsulin 41.67 microgram drop 1|20 ml # The drop was an old "unit" that was # replaced by the minim. But I was # told by a pharmacist that in his # profession, the conversion of 20 # drops per ml is actually used. bloodunit 450 ml # For whole blood. For blood # components, a blood unit is the # quanity of the component found in a # blood unit of whole blood. The # human body contains about 12 blood # units of whole blood. # # misc medical measure # frenchcathetersize 1|3 mm # measure used for the outer diameter # of a catheter charriere frenchcathetersize !endcategory !category fixups "Irregular Unit Pefixes" # # fixup units for times when prefix handling doesn't do the job # hectare hectoare megohm megaohm kilohm kiloohm microhm microohm megalerg megaerg # 'L' added to make it pronounceable [18]. !endcategory !category wood "Wood Measures" # # Units used for measuring volume of wood # cord 4*4*8 ft^3 # 4 ft by 4 ft by 8 ft bundle of wood facecord 1|2 cord cordfoot 1|8 cord # One foot long section of a cord cordfeet cordfoot housecord 1|3 cord # Used to sell firewood for residences, # often confusingly called a "cord" boardfoot ft^2 inch # Usually 1 inch thick wood boardfeet boardfoot fbm boardfoot # feet board measure stack 4 yard^3 # British, used for firewood and coal [18] rick 4 ft 8 ft 16 inches # Stack of firewood, supposedly # sometimes called a face cord, but this # value is equal to 1|3 cord. Name # comes from an old Norse word for a # stack of wood. stere m^3 timberfoot ft^3 # Used for measuring solid blocks of wood standard 120 12 ft 11 in 1.5 in # This is the St Petersburg or # Pittsburg standard. Apparently the # term is short for "standard hundred" # which was meant to refer to 100 pieces # of wood (deals). However, this # particular standard is equal to 120 # deals which are 12 ft by 11 in by 1.5 # inches (not the standard deal). hoppusfoot (4/pi) ft^3 # Volume calculation suggested in 1736 hoppusboardfoot 1|12 hoppusfoot # forestry manual by Edward Hoppus, for hoppuston 50 hoppusfoot # estimating the usable volume of a log. # It results from computing the volume # of a cylindrical log of length, L, and # girth (circumference), G, by V=L(G/4)^2. # The hoppus ton is apparently still in # use for shipments from Southeast Asia. # In Britain, the deal is apparently any piece of wood over 6 feet long, over # 7 wide and 2.5 inches thick. The OED doesn't give a standard size. A piece # of wood less than 7 inches wide is called a "batten". This unit is now used # exclusively for fir and pine. deal 12 ft 11 in 2.5 in # The standard North American deal [OED] wholedeal 12 ft 11 in 1.25 in # If it's half as thick as the standard # deal it's called a "whole deal"! splitdeal 12 ft 11 in 5|8 in # And half again as thick is a split deal. # Used for shellac mixing rate poundcut pound / gallon lbcut poundcut !endcategory !category flow_units "Fluid Flow Units" # # Gas and Liquid flow units # #FLUID_FLOW VOLUME / TIME # Some obvious volumetric gas flow units (cu is short for cubic) cumec m^3/s cusec ft^3/s # Conventional abbreviations for fluid flow units gph gal/hr gpm gal/min mgd megagal/day cfs ft^3/s cfh ft^3/hour cfm ft^3/min lpm liter/min lfm ft/min # Used to report air flow produced by fans. # Multiply by cross sectional area to get a # flow in cfm. pru mmHg / (ml/min) # peripheral resistance unit, used in # medicine to assess blood flow in # the capillaries. # Miner's inch: This is an old historic unit used in the Western United # States. It is generally defined as the rate of flow through a one square # inch hole at a specified depth such as 4 inches. In the late 19th century, # volume of water was sometimes measured in the "24 hour inch". Values for the # miner's inch were fixed by state statues. (This information is from a web # site operated by the Nevada Division of Water Planning: The Water Words # Dictionary at http://www.state.nv.us/cnr/ndwp/dict-1/waterwds.htm.) minersinchAZ 1.5 ft^3/min minersinchCA 1.5 ft^3/min minersinchMT 1.5 ft^3/min minersinchNV 1.5 ft^3/min minersinchOR 1.5 ft^3/min minersinchID 1.2 ft^3/min minersinchKS 1.2 ft^3/min minersinchNE 1.2 ft^3/min minersinchNM 1.2 ft^3/min minersinchND 1.2 ft^3/min minersinchSD 1.2 ft^3/min minersinchUT 1.2 ft^3/min minersinchCO 1 ft^3/sec / 38.4 # 38.4 miner's inches = 1 ft^3/sec minersinchBC 1.68 ft^3/min # British Columbia # Oceanographic flow sverdrup 1e6 m^3 / sec # Used to express flow of ocean # currents. Named after Norwegian # oceanographer H. Sverdrup. # In vacuum science and some other applications, gas flow is measured # as the product of volumetric flow and pressure. This is useful # because it makes it easy to compare with the flow at standard # pressure (one atmosphere). It also directly relates to the number # of gas molecules per unit time, and hence to the mass flow if the # molecular mass is known. #GAS_FLOW PRESSURE FLUID_FLOW sccm atm cc/min # 's' is for "standard" to indicate sccs atm cc/sec # flow at standard pressure scfh atm ft^3/hour # scfm atm ft^3/min slpm atm liter/min slph atm liter/hour lusec liter micron Hg / s # Used in vacuum science !endcategory !category atmospheric "Atmospheric Measures" # US Standard Atmosphere (1976) # Atmospheric temperature and pressure vs. geometric height above sea level # This definition covers only the troposphere (the lowest atmospheric # layer, up to 11 km), and assumes the layer is polytropic. # A polytropic process is one for which PV^k = const, where P is the # pressure, V is the volume, and k is the polytropic exponent. The # polytropic index is n = 1 / (k - 1). As noted in the Wikipedia article # https://en.wikipedia.org/wiki/Polytropic_process, some authors reverse # the definitions of "exponent" and "index." The functions below assume # the following parameters: # temperature lapse rate, -dT/dz, in troposphere lapserate 6.5 K/km # US Std Atm (1976) # air molecular weight, including constituent mol wt, given # in Table 3, p. 3 air_1976 78.084 % 28.0134 g/mol \ + 20.9476 % 31.9988 g/mol \ + 9340 ppm 39.948 g/mol \ + 314 ppm 44.00995 g/mol \ + 18.18 ppm 20.183 g/mol \ + 5.24 ppm 4.0026 g/mol \ + 2 ppm 16.04303 g/mol \ + 1.14 ppm 83.80 g/mol \ + 0.55 ppm 2.01594 g/mol \ + 0.087 ppm 131.30 g/mol # universal gas constant R_1976 8.31432e3 N m/(kmol K) # polytropic index n polyndx_1976 air_1976 gravity/(R_1976 lapserate) - 1 # If desired, redefine using current values for air mol wt and R polyndx polyndx_1976 # polyndx air (kg/kmol) gravity/(R lapserate) - 1 # for comparison with various references polyexpnt (polyndx + 1) / polyndx # The model assumes the following reference values: # sea-level temperature and pressure stdatmT0 288.15 K stdatmP0 atm # "effective radius" for relation of geometric to geopotential height, # at a latitude at which g = 9.80665 m/s (approximately 45.543 deg); no # relation to actual radius earthradUSAtm 6356766 m # Temperature vs. geopotential height h # Assumes 15 degC at sea level # Based on approx 45 deg latitude # Lower limits of domain and upper limits of range are those of the # tables in US Standard Atmosphere (NASA 1976) #stdatmTH(h) units=[m;K] domain=[-5000,11e3] range=[217,321] \ # stdatmT0+(-lapserate h) ; (stdatmT0+(-stdatmTH))/lapserate # Temperature vs. geometric height z; based on approx 45 deg latitude #stdatmT(z) units=[m;K] domain=[-5000,11e3] range=[217,321] \ # stdatmTH(geop_ht(z)) ; ~geop_ht(~stdatmTH(stdatmT)) # Pressure vs. geopotential height h # Assumes 15 degC and 101325 Pa at sea level # Based on approx 45 deg latitude # Lower limits of domain and upper limits of range are those of the # tables in US Standard Atmosphere (NASA 1976) #stdatmPH(h) units=[m;Pa] domain=[-5000,11e3] range=[22877,177764] \ # atm (1 - (lapserate/stdatmT0) h)^(polyndx + 1) ; \ # (stdatmT0/lapserate) (1+(-(stdatmPH/stdatmP0)^(1/(polyndx + 1)))) # Pressure vs. geometric height z; based on approx 45 deg latitude #stdatmP(z) units=[m;Pa] domain=[-5000,11e3] range=[22877,177764] \ # stdatmPH(geop_ht(z)); ~geop_ht(~stdatmPH(stdatmP)) # Geopotential height from geometric height # Based on approx 45 deg latitude # Lower limits of domain and range are somewhat arbitrary; they # correspond to the limits in the US Std Atm tables #geop_ht(z) units=[m;m] domain=[-5000,) range=[-5004,) \ # (earthradUSAtm z) / (earthradUSAtm + z) ; \ # (earthradUSAtm geop_ht) / (earthradUSAtm + (-geop_ht)) # The standard value for the sea-level acceleration due to gravity is # 9.80665 m/s^2, but the actual value varies with latitude (Harrison 1949) # R_eff = 2 g_phi / denom # g_phi = 978.0356e-2 (1+0.0052885 sin(lat)^2+(-0.0000059) sin(2 lat)^2) # or # g_phi = 980.6160e-2 (1+(-0.0026373) cos(2 lat)+0.0000059 cos(2 lat)^2) # denom = 3.085462e-6+2.27e-9 cos(2 lat)+(-2e-12) cos(4 lat) (minutes?) # There is no inverse function; the standard value applies at a latitude # of about 45.543 deg #g_phi(lat) units=[deg;m/s2] domain=[0,90] noerror \ # 980.6160e-2 (1+(-0.0026373) cos(2 lat)+0.0000059 cos(2 lat)^2) m/s2 # effective Earth radius for relation of geometric height to # geopotential height, as function of latitude (Harrison 1949) #earthradius_eff(lat) units=[deg;m] domain=[0,90] noerror \ # m 2 9.780356 (1+0.0052885 sin(lat)^2+(-0.0000059) sin(2 lat)^2) / \ # (3.085462e-6 + 2.27e-9 cos(2 lat) + (-2e-12) cos(4 lat)) # References # Harrison, L.P. 1949. Relation Between Geopotential and Geometric # Height. In Smithsonian Meteorological Tables. List, Robert J., ed. # 6th ed., 4th reprint, 1968. Washington, DC: Smithsonian Institution. # NASA. US National Aeronautics and Space Administration. 1976. # US Standard Atmosphere 1976. Washington, DC: US Government Printing Office. # Gauge pressure functions # # Gauge pressure is measured relative to atmospheric pressure. In the English # system, where pressure is often given in pounds per square inch, gauge # pressure is often indicated by 'psig' to distinguish it from absolute # pressure, often indicated by 'psia'. At the standard atmospheric pressure # of 14.696 psia, a gauge pressure of 0 psig is an absolute pressure of 14.696 # psia; an automobile tire inflated to 31 psig has an absolute pressure of # 45.696 psia. # # With gaugepressure(), the units must be specified (e.g., gaugepressure(1.5 # bar)); with psig(), the units are taken as psi, so the example above of tire # pressure could be given as psig(31). # # If the normal elevation is significantly different from sea level, change # Patm appropriately, and adjust the lower domain limit on the gaugepressure # definition. #Patm atm #gaugepressure(x) units=[Pa;Pa] domain=[-101325,) range=[0,) \ # x + Patm ; gaugepressure+(-Patm) #psig(x) units=[1;Pa] domain=[-14.6959487755135,) range=[0,) \ # gaugepressure(x psi) ; ~gaugepressure(psig) / psi !endcategory !category gauges "Wire Gauges" # # Wire Gauge # # This area is a nightmare with huge charts of wire gauge diameters # that usually have no clear origin. There are at least 5 competing wire gauge # systems to add to the confusion. The use of wire gauge is related to the # manufacturing method: a metal rod is heated and drawn through a hole. The # size change can't be too big. To get smaller wires, the process is repeated # with a series of smaller holes. Generally larger gauges mean smaller wires. # The gauges often have values such as "00" and "000" which are larger sizes # than simply "0" gauge. In the tables that appear below, these gauges must be # specified as negative numbers (e.g. "00" is -1, "000" is -2, etc). # Alternatively, you can use the following units: # g00 (-1) g000 (-2) g0000 (-3) g00000 (-4) g000000 (-5) g0000000 (-6) # American Wire Gauge (AWG) or Brown & Sharpe Gauge appears to be the most # important gauge. ASTM B-258 specifies that this gauge is based on geometric # interpolation between gauge 0000, which is 0.46 inches exactly, and gauge 36 # which is 0.005 inches exactly. Therefore, the diameter in inches of a wire # is given by the formula 1|200 92^((36-g)/39). Note that 92^(1/39) is close # to 2^(1/6), so diameter is approximately halved for every 6 gauges. For the # repeated zero values, use negative numbers in the formula. The same document # also specifies rounding rules which seem to be ignored by makers of tables. # Gauges up to 44 are to be specified with up to 4 significant figures, but no # closer than 0.0001 inch. Gauges from 44 to 56 are to be rounded to the # nearest 0.00001 inch. # # In addition to being used to measure wire thickness, this gauge is used to # measure the thickness of sheets of aluminum, copper, and most metals other # than steel, iron and zinc. #wiregauge(g) units=[1;m] range=(0,) \ # 1|200 92^((36+(-g))/39) in; 36+(-39)ln(200 wiregauge/in)/ln(92) #awg() wiregauge # Next we have the SWG, the Imperial or British Standard Wire Gauge. This one # is piecewise linear. It was used for aluminum sheets. #brwiregauge[in] \ # -6 0.5 \ # -5 0.464 \ # -3 0.4 \ # -2 0.372 \ # 3 0.252 \ # 6 0.192 \ # 10 0.128 \ # 14 0.08 \ # 19 0.04 \ # 23 0.024 \ # 26 0.018 \ # 28 0.0148 \ # 30 0.0124 \ # 39 0.0052 \ # 49 0.0012 \ # 50 0.001 # The following is from the Appendix to ASTM B 258 # # For example, in U.S. gage, the standard for sheet metal is based on the # weight of the metal, not on the thickness. 16-gage is listed as # approximately .0625 inch thick and 40 ounces per square foot (the original # standard was based on wrought iron at .2778 pounds per cubic inch; steel # has almost entirely superseded wrought iron for sheet use, at .2833 pounds # per cubic inch). Smaller numbers refer to greater thickness. There is no # formula for converting gage to thickness or weight. # # It's rather unclear from the passage above whether the plate gauge values are # therefore wrong if steel is being used. Reference [15] states that steel is # in fact measured using this gauge (under the name Manufacturers' Standard # Gauge) with a density of 501.84 lb/ft3 = 0.2904 lb/in3 used for steel. # But this doesn't seem to be the correct density of steel (.2833 lb/in3 is # closer). # # This gauge was established in 1893 for purposes of taxation. # Old plate gauge for iron #plategauge[(oz/ft^2)/(480*lb/ft^3)] \ # -5 300 \ # 1 180 \ # 14 50 \ # 16 40 \ # 17 36 \ # 20 24 \ # 26 12 \ # 31 7 \ # 36 4.5 \ # 38 4 # Manufacturers Standard Gage #stdgauge[(oz/ft^2)/(501.84*lb/ft^3)] \ # -5 300 \ # 1 180 \ # 14 50 \ # 16 40 \ # 17 36 \ # 20 24 \ # 26 12 \ # 31 7 \ # 36 4.5 \ # 38 4 # A special gauge is used for zinc sheet metal. Notice that larger gauges # indicate thicker sheets. #zincgauge[in] \ # 1 0.002 \ # 10 0.02 \ # 15 0.04 \ # 19 0.06 \ # 23 0.1 \ # 24 0.125 \ # 27 0.5 \ # 28 1 !endcategory !category screw_sizes "Screw sizes" # # Screw sizes # # In the USA, screw diameters are reported using a gauge number. # Metric screws are reported as Mxx where xx is the diameter in mm. # #screwgauge(g) units=[1;m] range=[0,) \ # (.06 + .013 g) in ; (screwgauge/in + (-.06)) / .013 !endcategory !category grits "Grit Sizes" # # Abrasive grit size # # Standards governing abrasive grit sizes are complicated, specifying # fractions of particles that are passed or retained by different mesh # sizes. As a result, it is not possible to make precise comparisons # of different grit standards. The tables below allow the # determination of rough equivlants by using median particle size. # # Standards in the USA are determined by the Unified Abrasives # Manufacturers' Association (UAMA), which resulted from the merger of # several previous organizations. One of the old organizations was # CAMI (Coated Abrasives Manufacturers' Institute). # # UAMA has a web page with plots showing abrasive particle ranges for # various different grits and comparisons between standards. # # http://www.uama.org/Abrasives101/101Standards.html # # Abrasives are grouped into "bonded" abrasives for use with grinding # wheels and "coated" abrasives for sandpapers and abrasive films. # The industry uses different grit standards for these two # categories. # # Another division is between "macrogrits", grits below 240 and # "microgrits", which are above 240. Standards differ, as do methods # for determining particle size. In the USA, ANSI B74.12 is the # standard governing macrogrits. ANSI B74.10 covers bonded microgrit # abrasives, and ANSI B74.18 covers coated microgrit abrasives. It # appears that the coated standard is identical to the bonded standard # for grits up through 600 but then diverges significantly. # # European grit sizes are determined by the Federation of European # Producers of Abrasives. http://www.fepa-abrasives.org # # They give two standards, the "F" grit for bonded abrasives and the # "P" grit for coated abrasives. This data is taken directly from # their web page. # FEPA P grit for coated abrasives is commonly seen on sandpaper in # the USA where the paper will be marked P600, for example. FEPA P # grits are said to be more tightly constrained than comparable ANSI # grits so that the particles are more uniform in size and hence give # a better finish. #grit_P[micron] \ # 12 1815 \ # 16 1324 \ # 20 1000 \ # 24 764 \ # 30 642 \ # 36 538 \ # 40 425 \ # 50 336 \ # 60 269 \ # 80 201 \ # 100 162 \ # 120 125 \ # 150 100 \ # 180 82 \ # 220 68 \ # 240 58.5 \ # 280 52.2 \ # 320 46.2 \ # 360 40.5 \ # 400 35 \ # 500 30.2 \ # 600 25.8 \ # 800 21.8 \ # 1000 18.3 \ # 1200 15.3 \ # 1500 12.6 \ # 2000 10.3 \ # 2500 8.4 # The F grit is the European standard for bonded abrasives such as # grinding wheels #grit_F[micron] \ # 4 4890 \ # 5 4125 \ # 6 3460 \ # 7 2900 \ # 8 2460 \ # 10 2085 \ # 12 1765 \ # 14 1470 \ # 16 1230 \ # 20 1040 \ # 22 885 \ # 24 745 \ # 30 625 \ # 36 525 \ # 40 438 \ # 46 370 \ # 54 310 \ # 60 260 \ # 70 218 \ # 80 185 \ # 90 154 \ # 100 129 \ # 120 109 \ # 150 82 \ # 180 69 \ # 220 58 \ # 230 53 \ # 240 44.5 \ # 280 36.5 \ # 320 29.2 \ # 360 22.8 \ # 400 17.3 \ # 500 12.8 \ # 600 9.3 \ # 800 6.5 \ # 1000 4.5 \ # 1200 3 \ # 1500 2.0 \ # 2000 1.2 # According to the UAMA web page, the ANSI bonded and ANSI coated standards # are identical to FEPA F in the macrogrit range (under 240 grit), so these # values are taken from the FEPA F table. The values for 240 and above are # from the UAMA web site and represent the average of the "d50" range # endpoints listed there. # ansibonded[micron] \ # 4 4890 \ # 5 4125 \ # 6 3460 \ # 7 2900 \ # 8 2460 \ # 10 2085 \ # 12 1765 \ # 14 1470 \ # 16 1230 \ # 20 1040 \ # 22 885 \ # 24 745 \ # 30 625 \ # 36 525 \ # 40 438 \ # 46 370 \ # 54 310 \ # 60 260 \ # 70 218 \ # 80 185 \ # 90 154 \ # 100 129 \ # 120 109 \ # 150 82 \ # 180 69 \ # 220 58 \ # 240 50 \ # 280 39.5 \ # 320 29.5 \ # 360 23 \ # 400 18.25 \ # 500 13.9 \ # 600 10.55 \ # 800 7.65 \ # 1000 5.8 \ # 1200 3.8 # grit_ansibonded() ansibonded # Like the bonded grit, the coated macrogrits below 240 are taken from the # FEPA F table. Data above this is from the UAMA site. Note that the coated # and bonded standards are evidently the same from 240 up to 600 grit, but # starting at 800 grit, the coated standard diverges. The data from UAMA show # that 800 grit coated has an average size slightly larger than the average # size of 600 grit coated/bonded. However, the 800 grit has a significantly # smaller particle size variation. # # Because of this non-monotonicity from 600 grit to 800 grit this definition # produces a warning about the lack of a unique inverse. # ansicoated[micron] noerror \ # 4 4890 \ # 5 4125 \ # 6 3460 \ # 7 2900 \ # 8 2460 \ # 10 2085 \ # 12 1765 \ # 14 1470 \ # 16 1230 \ # 20 1040 \ # 22 885 \ # 24 745 \ # 30 625 \ # 36 525 \ # 40 438 \ # 46 370 \ # 54 310 \ # 60 260 \ # 70 218 \ # 80 185 \ # 90 154 \ # 100 129 \ # 120 109 \ # 150 82 \ # 180 69 \ # 220 58 \ # 240 50 \ # 280 39.5 \ # 320 29.5 \ # 360 23 \ # 400 18.25 \ # 500 13.9 \ # 600 10.55 \ # 800 11.5 \ # 1000 9.5 \ # 2000 7.2 \ # 2500 5.5 \ # 3000 4 \ # 4000 3 \ # 6000 2 \ # 8000 1.2 # grit_ansicoated() ansicoated # # Is this correct? This is the JIS Japanese standard used on waterstones # # jisgrit[micron] \ # 150 75 \ # 180 63 \ # 220 53 \ # 280 48 \ # 320 40 \ # 360 35 \ # 400 30 \ # 600 20 \ # 700 17 \ # 800 14 \ # 1000 11.5 \ # 1200 9.5 \ # 1500 8 \ # 2000 6.7 \ # 2500 5.5 \ # 3000 4 \ # 4000 3 \ # 6000 2 \ # 8000 1.2 # The "Finishing Scale" marked with an A (e.g. A75). This information # is from the web page of the sand paper manufacturer Klingspor # http://www.klingspor.com/gritgradingsystems.htm # # I have no information about what this scale is used for. # grit_A[micron]\ # 16 15.3 \ # 25 21.8 \ # 30 23.6 \ # 35 25.75 \ # 45 35 \ # 60 46.2 \ # 65 53.5 \ # 75 58.5 \ # 90 65 \ # 110 78 \ # 130 93 \ # 160 127 \ # 200 156 # # Grits for DMT brand diamond sharpening stones from # http://dmtsharp.com/products/colorcode.htm # dmtxxcoarse 120 micron # 120 mesh dmtsilver dmtxxcoarse dmtxx dmtxxcoarse dmtxcoarse 60 micron # 220 mesh dmtx dmtxcoarse dmtblack dmtxcoarse dmtcoarse 45 micron # 325 mesh dmtc dmtcoarse dmtblue dmtcoarse dmtfine 25 micron # 600 mesh dmtred dmtfine dmtf dmtfine dmtefine 9 micron # 1200 mesh dmte dmtefine dmtgreen dmtefine dmtceramic 7 micron # 2200 mesh dmtcer dmtceramic dmtwhite dmtceramic dmteefine 3 micron # 8000 mesh dmttan dmteefine dmtee dmteefine # # The following values come from a page in the Norton Stones catalog, # available at their web page, http://www.nortonstones.com. # hardtranslucentarkansas 6 micron # Natural novaculite (silicon quartz) softarkansas 22 micron # stones extrafineindia 22 micron # India stones are Norton's manufactured fineindia 35 micron # aluminum oxide product mediumindia 53.5 micron coarseindia 97 micron finecrystolon 45 micron # Crystolon stones are Norton's mediumcrystalon 78 micron # manufactured silicon carbide product coarsecrystalon 127 micron # The following are not from the Norton catalog hardblackarkansas 6 micron hardwhitearkansas 11 micron washita 35 micron !endcategory !category ring_sizes "Ring Sizes" # # Ring size. All ring sizes are given as the circumference of the ring. # # USA ring sizes. Several slightly different definitions seem to be in # circulation. According to [15], the interior diameter of size n ring in # inches is 0.32 n + 0.458 for n ranging from 3 to 13.5 by steps of 0.5. The # size 2 ring is inconsistently 0.538in and no 2.5 size is listed. # # However, other sources list 0.455 + 0.0326 n and 0.4525 + 0.0324 n as the # diameter and list no special case for size 2. (Or alternatively they are # 1.43 + .102 n and 1.4216+.1018 n for measuring circumference in inches.) One # reference claimed that the original system was that each size was 1|10 inch # circumference, but that source doesn't have an explanation for the modern # system which is somewhat different. #ringsize(n) units=[1;in] domain=[2,) range=[1.6252,) \ # (1.4216+.1018 n) in ; (ringsize/in + (-1.4216))/.1018 # Old practice in the UK measured rings using the "Wheatsheaf gauge" with sizes # specified alphabetically and based on the ring inside diameter in steps of # 1|64 inch. This system was replaced in 1987 by British Standard 6820 which # specifies sizes based on circumference. Each size is 1.25 mm different from # the preceding size. The baseline is size C which is 40 mm circumference. # The new sizes are close to the old ones. Sometimes it's necessary to go # beyond size Z to Z+1, Z+2, etc. sizeAring 37.50 mm sizeBring 38.75 mm sizeCring 40.00 mm sizeDring 41.25 mm sizeEring 42.50 mm sizeFring 43.75 mm sizeGring 45.00 mm sizeHring 46.25 mm sizeIring 47.50 mm sizeJring 48.75 mm sizeKring 50.00 mm sizeLring 51.25 mm sizeMring 52.50 mm sizeNring 53.75 mm sizeOring 55.00 mm sizePring 56.25 mm sizeQring 57.50 mm sizeRring 58.75 mm sizeSring 60.00 mm sizeTring 61.25 mm sizeUring 62.50 mm sizeVring 63.75 mm sizeWring 65.00 mm sizeXring 66.25 mm sizeYring 67.50 mm sizeZring 68.75 mm # Japanese sizes start with size 1 at a 13mm inside diameter and each size is # 1|3 mm larger in diameter than the previous one. They are multiplied by pi # to give circumference. #jpringsize(n) units=[1;mm] domain=[1,) range=[0.040840704,) \ # (38|3 + n/3) pi mm ; 3 jpringsize/ pi mm + (-38) # The European ring sizes are the length of the circumference in mm minus 40. #euringsize(n) units=[1;mm] (n+40) mm ; euringsize/mm + (-40) !endcategory !category abbrevs "Abbreviations" # # Abbreviations # mph mile/hr mpg mile/gal kph km/hr kmh km/hr fL footlambert fpm ft/min fps ft/s rpm rev/min rps rev/sec smi mile nmi nauticalmile mbh 1e3 btu/hour mcm 1e3 circularmil ipy inch/year # used for corrosion rates ccf 100 ft^3 # used for selling water [18] Mcf 1000 ft^3 # not million cubic feet [18] kp kilopond kpm kp meter Wh W hour hph hp hour plf lb / foot # pounds per linear foot !endcategory !category compat "Compatibility with unix units" # # Compatibility units with unix version # pa Pa ev eV hg Hg oe Oe mh mH rd rod pf pF gr grain nt N hz Hz hd hogshead dry drygallon/gallon nmile nauticalmile beV GeV bev beV coul C !endcategory !category radioactivity "Radioactivity Units" # # Radioactivity units # curie 3.7e10 Bq # Defined in 1910 as the radioactivity Ci curie # emitted by the amount of radon that is # in equilibrium with 1 gram of radium. rutherford 1e6 Bq # radiation_dose gray rad 1e-2 Gy # From Radiation Absorbed Dose rep 8.38 mGy # Roentgen Equivalent Physical, the amount # of radiation which , absorbed in the # body, would liberate the same amount # of energy as 1 roentgen of X rays # would, or 97 ergs. rem 1e-2 Sv # keV X-rays. Different types of # radiation are weighted by the # Relative Biological Effectiveness # (RBE). # # Radiation type RBE # X-ray, gamma ray 1 # beta rays, > 1 MeV 1 # beta rays, < 1 MeV 1.08 # neutrons, < 1 MeV 4-5 # neutrons, 1-10 MeV 10 # protons, 1 MeV 8.5 # protons, .1 MeV 10 # alpha, 5 MeV 15 # alpha, 1 MeV 20 # # The energies are the kinetic energy # of the particles. Slower particles # interact more, so they are more # effective ionizers, and hence have # higher RBE values. # # rem stands for Roentgen Equivalent # Mammal roentgen 2.58e-4 C / kg # Ionizing radiation that produces # 1 statcoulomb of charge in 1 cc of # dry air at stp. rontgen roentgen # Sometimes it appears spelled this way sievertunit 8.38 rontgen # Unit of gamma ray dose delivered in one # hour at a distance of 1 cm from a # point source of 1 mg of radium # enclosed in platinum .5 mm thick. eman 1e-7 Ci/m^3 # radioactive concentration mache 3.7e-7 Ci/m^3 !endcategory !category population "Population units" # # population units # people 1 person people death people capita people percapita /capita !endcategory !category dozenal "Dozenal Units" # TGM dozen based unit system listed on the "dozenal" forum # http://www.dozenalsociety.org.uk/apps/tgm.htm. These units are # proposed as an allegedly more rational alternative to the SI system. Tim 12^-4 hour # Time Grafut gravity Tim^2 # Length based on gravity Surf Grafut^2 # area Volm Grafut^3 # volume Vlos Grafut/Tim # speed Denz Maz/Volm # density Mag Maz gravity # force Maz Volm kg / oldliter # mass based on water Tm Tim # Abbreviations Gf Grafut Sf Surf Vm Volm Vl Vlos Mz Maz Dz Denz # Dozen based unit prefixes Zena- 12 Duna- 12^2 Trina- 12^3 Quedra- 12^4 Quena- 12^5 Hesa- 12^6 Seva- 12^7 Aka- 12^8 Neena- 12^9 Dexa- 12^10 Lefa- 12^11 Zennila- 12^12 Zeni- 12^-1 Duni- 12^-2 Trini- 12^-3 Quedri- 12^-4 Queni- 12^-5 Hesi- 12^-6 Sevi- 12^-7 Aki- 12^-8 Neeni- 12^-9 Dexi- 12^-10 Lefi- 12^-11 Zennili- 12^-12 !endcategory !category japanese "Traditional Japanese Units" # # Traditional Japanese units (shakkanhou) # # The traditional system of weights and measures is called shakkanhou from the # shaku and the ken. Japan accepted SI units in 1891 and legalized conversions # to the traditional system. In 1909 the inch-pound system was also legalized, # so Japan had three legally approved systems. A change to the metric system # started in 1921 but there was a lot of resistance. The Measurement Law of # October 1999 prohibits sales in anything but SI units. However, the old # units still live on in construction and as the basis for paper sizes of books # and tools used for handicrafts. # # Note that units below use the Hepburn romanization system. Some other # systems would render "mou", "jou", and "chou" as "mo", "jo" and "cho". # # # http://hiramatu-hifuka.com/onyak/onyindx.html # Japanese Proportions. These are still in everyday use. They also # get used as units to represent the proportion of the standard unit. wari_proportion 1|10 wari wari_proportion bu_proportion 1|100 # The character bu can also be read fun or bun # but usually "bu" is used for units. rin_proportion 1|1000 mou_proportion 1|10000 # Japanese Length Measures # # The length system is called kanejaku or # square and originated in China. It was # adopted as Japan's official measure in 701 # by the Taiho Code. This system is still in # common use in architecture and clothing. shaku 1|3.3 m mou 1|10000 shaku rin 1|1000 shaku bu_distance 1|100 shaku ja_sun 1|10 shaku jou_distance 10 shaku jou jou_distance kanejakusun ja_sun # Alias to emphasize architectural name kanejaku shaku kanejakujou jou # http://en.wikipedia.org/wiki/Taiwanese_units_of_measurement taichi shaku # http://zh.wikipedia.org/wiki/台尺 taicun ja_sun # http://zh.wikipedia.org/wiki/台制 台尺 taichi # via Hanyu Pinyin romanizations 台寸 taicun # In context of clothing, shaku is different from architecture # http://www.scinet.co.jp/sci/sanwa/kakizaki-essay54.html kujirajaku 10|8 shaku kujirajakusun 1|10 kujirajaku kujirajakubu 1|100 kujirajaku kujirajakujou 10 kujirajaku tan_distance 3 kujirajakujou ken 6 shaku # Also sometimes 6.3, 6.5, or 6.6 # http://www.homarewood.co.jp/syakusun.htm # mostly unused chou_distance 60 ken chou chou_distance ri 36 chou # Japanese Area Measures # Tsubo is still used for land size, though the others are more # recognized by their homonyms in the other measurements. gou_area 1|10 tsubo tsubo 36 shaku^2 # Size of two tatami = ken^2 ?? se 30 tsubo tan_area 10 se chou_area 10 tan_area # http://en.wikipedia.org/wiki/Taiwanese_units_of_measurement ping tsubo # http://zh.wikipedia.org/wiki/坪 jia 2934 ping # http://zh.wikipedia.org/wiki/甲_(单位) #fen 1|10 jia # http://zh.wikipedia.org/wiki/分 fen_area 1|10 jia # Protection against future collisions 坪 ping # via Hanyu Pinyin romanizations 甲 jia #分 fen 分地 fen_area # Protection against future collisions # Japanese architecture is based on a "standard" size of tatami mat. # Room sizes today are given in number of tatami, and this number # determines the spacing between colums and hence sizes of sliding # doors and paper screens. However, every region has its own slightly # different tatami size. Edoma, used in and around Tokyo and # Hokkaido, is becoming a nationwide standard. Kyouma is used around # Kyoto, Osaka and Kyuushu, and Chuukyouma is used around Nagoya. # Note that the tatami all have the aspect ratio 2:1 so that the mats # can tile the room with some of them turned 90 degrees. # # http://www.moon2.net/tatami/infotatami/structure.html edoma (5.8*2.9) shaku^2 kyouma (6.3*3.15) shaku^2 chuukyouma (6*3) shaku^2 jou_area edoma tatami jou_area # Japanese Volume Measures # The "shou" is still used for such things as alcohol and seasonings. # Large quantities of paint are still purchased in terms of "to". shaku_volume 1|10 gou_volume gou_volume 1|10 shou gou gou_volume shou (4.9*4.9*2.7) ja_sun^3# The character shou which is # the same as masu refers to a # rectangular wooden cup used to # measure liquids and cereal. # Sake is sometimes served in a masu # Note that it happens to be # EXACTLY 7^4/11^3 liters. to 10 shou koku 10 to # No longer used; historically a measure of rice # Japanese Weight Measures # # http://wyoming.hp.infoseek.co.jp/zatugaku/zamoney.html # Not really used anymore. rin_weight 1|10 bu_weight bu_weight 1|10 monme fun 1|10 monme monme momme kin 160 monme kan 1000 monme kwan kan # This was the old pronounciation of the unit. # The old spelling persisted a few centuries # longer and was not changed until around # 1950. !endcategory !category taiwan "Taiwanese Units" # http://en.wikipedia.org/wiki/Taiwanese_units_of_measurement # says: "Volume measure in Taiwan is largely metric". taijin kin # http://zh.wikipedia.org/wiki/台斤 tailiang 10 monme # http://zh.wikipedia.org/wiki/台斤 taiqian monme # http://zh.wikipedia.org/wiki/台制 台斤 taijin # via Hanyu Pinyin romanizations 台兩 tailiang 台錢 taiqian !endcategory !category australian "Australian units" # # Australian unit # australiasquare (10 ft)^2 # Used for house area !endcategory !category german "German units" # # A few German units as currently in use. # zentner 50 kg doppelzentner 2 zentner pfund 500 g !endcategory !category russian "Traditional Russian Units" # # Some traditional Russian measures # # length точка 1|10 линия tochka точка линия 1|10 дюим liniya линия дюим 1 inch dyuim дюим вершок 1.75 in vershok вершок пядь 7 дюим piad пядь четверть пядь chetvert четверть фут 1 foot fut фут аршин 7|3 ft arshin аршин сажень 7 ft sazhen сажень верста 1500 аршин versta верста миля 10500 аршин milia миля # area казенная_десятина 2400 сажень^2 kazionnaya_desiatina казенная_десятина official_desiatina казенная_десятина владельческая_десятина 3200 сажень^2 vladelcheskaya_desiatina владельческая_десятина proprietors_desiatina владельческая_десятина # dry measures часть 1|12 сухкружка chast часть сухкружка 2|5 гарнец drykruzhka сухкружка гарнец 200 in^3 garnets гарнец сухведро 4 гарнец dryvedro сухведро четверик 2 сухведро chetverik четверик осьмина 4 четверик osmina осьмина сухчетверть 2 осьмина drychetvert четверть # liquid measures шкалик 1|2 чарка shlalik шкалик косушка 1|2 чарка kosushka косушка чарка 1|10 жидккружка charka чарка жидккружка 1|10 жидкведро fluidkruzhka жидккружка штоф 1|10 жидкведро shtof штоф жидкчетверть 1|8 жидкведро fluidchetvert жидкчетверть жидкведро 750 in^3 fuidvedro жидкведро бочка 40 жидкведро bochka бочка # common mass доля 1|96 золотник dolia доля золотник 1|3 лот zolotnik золотник лот 1|13 фунт lot лот фунт 0.903 lb funt фунт пуд 40 фунт pood пуд берковец 10 пуд berkovets берковец # apothecary mass гран 7|5 доля gran гран скрупул 20 гран scrupul скрупул драхма 3 скрупул drachma драхма унция 8 драхма uncia унция апфунт 12 унция apfunt фунт !endcategory !category french "French Old Measures" # # Old French distance measures, from French Weights and Measures # Before the Revolution by Zupko # frenchfoot 144|443.296 m # pied de roi, the standard of Paris. pied frenchfoot # Half of the hashimicubit, frenchfeet frenchfoot # instituted by Charlemagne. frenchinch 1|12 frenchfoot # This exact definition comes from frenchthumb frenchinch # a law passed on 10 Dec 1799 which pouce frenchthumb # fixed the meter at # 3 frenchfeet + 11.296 lignes. frenchline 1|12 frenchinch # This is supposed to be the size ligne frenchline # of the average barleycorn frenchpoint 1|12 frenchline toise 6 frenchfeet arpent 180^2 pied^2 # The arpent is 100 square perches, # but the perche seems to vary a lot # and can be 18 feet, 20 feet, or 22 # feet. This measure was described # as being in common use in Canada in # 1934 (Websters 2nd). The value # given here is the Paris standard # arpent. frenchgrain 1|18827.15 kg # Weight of a wheat grain, hence # smaller than the British grain. frenchpound 9216 frenchgrain !endcategory !category scots "Scotland Measures" # # Before the Imperial Weights and Measures Act of 1824, various different # weights and measures were in use in different places. # # Scots linear measure scotsinch 1.00540054 UKinch scotslink 1|100 scotschain scotsfoot 12 scotsinch scotsfeet scotsfoot scotsell 37 scotsinch scotsfall 6 scotsell scotschain 4 scotsfall scotsfurlong 10 scotschain scotsmile 8 scotsfurlong # Scots area measure scotsrood 40 scotsfall^2 scotsacre 4 scotsrood !endcategory !category irish "Ireland Measures" # Irish linear measure irishinch UKinch irishpalm 3 irishinch irishspan 3 irishpalm irishfoot 12 irishinch irishfeet irishfoot irishcubit 18 irishinch irishyard 3 irishfeet irishpace 5 irishfeet irishfathom 6 irishfeet irishpole 7 irishyard # Only these values irishperch irishpole # are different from irishchain 4 irishperch # the British Imperial irishlink 1|100 irishchain # or English values for irishfurlong 10 irishchain # these lengths. irishmile 8 irishfurlong # # Irish area measure irishrood 40 irishpole^2 irishacre 4 irishrood !endcategory !category winchester_wine "Winchester Wine Measures" # English wine capacity measures (Winchester measures) winepint 1|2 winequart winequart 1|4 winegallon winegallon 231 UKinch^3 # Sometimes called the Winchester Wine Gallon, # it was legalized in 1707 by Queen Anne, and # given the definition of 231 cubic inches. It # had been in use for a while as 8 pounds of wine # using a merchant's pound, but the definition of # the merchant's pound had become uncertain. A # pound of 15 tower ounces (6750 grains) had been # common, but then a pound of 15 troy ounces # (7200 grains) gained popularity. Because of # the switch in the value of the merchants pound, # the size of the wine gallon was uncertain in # the market, hence the official act in 1707. # The act allowed that a six inch tall cylinder # with a 7 inch diameter was a lawful wine # gallon. (This comes out to 230.9 in^3.) # Note also that in Britain a legal conversion # was established to the 1824 Imperial gallon # then taken as 277.274 in^3 so that the wine # gallon was 0.8331 imperial gallons. This is # 231.1 cubic inches (using the international # inch). winerundlet 18 winegallon winebarrel 31.5 winegallon winetierce 42 winegallon winehogshead 2 winebarrel winepuncheon 2 winetierce winebutt 2 winehogshead winepipe winebutt winetun 2 winebutt !endcategory !category wine "Wine and Spirits Measures" # English beer and ale measures used 1803-1824 and used for beer before 1688 beerpint 1|2 beerquart beerquart 1|4 beergallon beergallon 282 UKinch^3 beerbarrel 36 beergallon beerhogshead 1.5 beerbarrel # English ale measures used from 1688-1803 for both ale and beer alepint 1|2 alequart alequart 1|4 alegallon alegallon beergallon alebarrel 34 alegallon alehogshead 1.5 alebarrel !endcategory !category scots "Scotland Measures" # Scots capacity measure scotsgill 1|4 mutchkin mutchkin 1|2 choppin choppin 1|2 scotspint scotspint 1|2 scotsquart scotsquart 1|4 scotsgallon scotsgallon 827.232 UKinch^3 scotsbarrel 8 scotsgallon jug scotspint # Scots dry capacity measure scotswheatlippy 137.333 UKinch^3 # Also used for peas, beans, rye, salt scotswheatlippies scotswheatlippy scotswheatpeck 4 scotswheatlippy scotswheatfirlot 4 scotswheatpeck scotswheatboll 4 scotswheatfirlot scotswheatchalder 16 scotswheatboll scotsoatlippy 200.345 UKinch^3 # Also used for barley and malt scotsoatlippies scotsoatlippy scotsoatpeck 4 scotsoatlippy scotsoatfirlot 4 scotsoatpeck scotsoatboll 4 scotsoatfirlot scotsoatchalder 16 scotsoatboll # Scots Tron weight trondrop 1|16 tronounce tronounce 1|20 tronpound tronpound 9520 grain tronstone 16 tronpound !endcategory !category irish "Ireland Measures" # Irish liquid capacity measure irishnoggin 1|4 irishpint irishpint 1|2 irishquart irishquart 1|2 irishpottle irishpottle 1|2 irishgallon irishgallon 217.6 UKinch^3 irishrundlet 18 irishgallon irishbarrel 31.5 irishgallon irishtierce 42 irishgallon irishhogshead 2 irishbarrel irishpuncheon 2 irishtierce irishpipe 2 irishhogshead irishtun 2 irishpipe # Irish dry capacity measure irishpeck 2 irishgallon irishbushel 4 irishpeck irishstrike 2 irishbushel irishdrybarrel 2 irishstrike irishquarter 2 irishbarrel !endcategory !category english "English Measurements" # English Tower weights, abolished in 1528 towerpound 5400 grain towerounce 1|12 towerpound towerpennyweight 1|20 towerounce towergrain 1|32 towerpennyweight # English Mercantile weights, used since the late 12th century mercpound 6750 grain mercounce 1|15 mercpound mercpennyweight 1|20 mercounce # English weights for lead leadstone 12.5 lb fotmal 70 lb leadwey 14 leadstone fothers 12 leadwey # English Hay measure newhaytruss 60 lb # New and old here seem to refer to "new" newhayload 36 newhaytruss # hay and "old" hay rather than a new unit oldhaytruss 56 lb # and an old unit. oldhayload 36 oldhaytruss # English wool measure woolclove 7 lb woolstone 2 woolclove wooltod 2 woolstone woolwey 13 woolstone woolsack 2 woolwey woolsarpler 2 woolsack woollast 6 woolsarpler !endcategory ############################################################################# # # # Ancient history units: There tends to be uncertainty in the definitions # # of the units in this section # # These units are from [11] # ############################################################################# !category roman "Roman Measures" # Roman measure. The Romans had a well defined distance measure, but their # measures of weight were poor. They adopted local weights in different # regions without distinguishing among them so that there are half a dozen # different Roman "standard" weight systems. romanfoot 296 mm # There is some uncertainty in this definition romanfeet romanfoot # from which all the other units are derived. pes romanfoot # This value appears in numerous sources. In "The pedes romanfoot # Roman Land Surveyors", Dilke gives 295.7 mm. romaninch 1|12 romanfoot # The subdivisions of the Roman foot have the romandigit 1|16 romanfoot # same names as the subdivisions of the pound, romanpalm 1|4 romanfoot # but we can't have the names for different romancubit 18 romaninch # units. romanpace 5 romanfeet # Roman double pace (basic military unit) passus romanpace romanperch 10 romanfeet stade 125 romanpaces stadia stade stadium stade romanmile 8 stadia # 1000 paces romanleague 1.5 romanmile schoenus 4 romanmile # Other values for the Roman foot (from Dilke) earlyromanfoot 29.73 cm pesdrusianus 33.3 cm # or 33.35 cm, used in Gaul & Germany in 1st c BC lateromanfoot 29.42 cm # Roman areas actuslength 120 romanfeet # length of a Roman furrow actus 120*4 romanfeet^2 # area of the furrow squareactus 120^2 romanfeet^2 # actus quadratus acnua squareactus iugerum 2 squareactus iugera iugerum jugerum iugerum jugera iugerum heredium 2 iugera # heritable plot heredia heredium centuria 100 heredia centurium centuria # Roman volumes sextarius 35.4 in^3 # Basic unit of Roman volume. As always, sextarii sextarius # there is uncertainty. Six large Roman # measures survive with volumes ranging from # 34.4 in^3 to 39.55 in^3. Three of them # cluster around the size given here. # # But the values for this unit vary wildly # in other sources. One reference gives 0.547 # liters, but then says the amphora is a # cubic Roman foot. This gives a value for the # sextarius of 0.540 liters. And the # encyclopedia Brittanica lists 0.53 liters for # this unit. Both [7] and [11], which were # written by scholars of weights and measures, # give the value of 35.4 cubic inches. cochlearia 1|48 sextarius cyathi 1|12 sextarius acetabula 1|8 sextarius quartaria 1|4 sextarius quartarius quartaria heminae 1|2 sextarius hemina heminae cheonix 1.5 sextarii # Dry volume measures (usually) semodius 8 sextarius semodii semodius modius 16 sextarius modii modius # Liquid volume measures (usually) congius 12 heminae congii congius amphora 8 congii amphorae amphora # Also a dry volume measure culleus 20 amphorae quadrantal amphora # Roman weights libra 5052 grain # The Roman pound varied significantly librae libra # from 4210 grains to 5232 grains. Most of romanpound libra # the standards were obtained from the weight romanuncia 1|12 libra # of particular coins. The one given here is unciae romanuncia # based on the Gold Aureus of Augustus which romanounce romanuncia # was in use from BC 27 to AD 296. deunx 11 uncia dextans 10 uncia dodrans 9 uncia bes 8 uncia seprunx 7 uncia semis 6 uncia quincunx 5 uncia triens 4 uncia quadrans 3 uncia sextans 2 uncia sescuncia 1.5 uncia semuncia 1|2 uncia siscilius 1|4 uncia sextula 1|6 uncia semisextula 1|12 uncia scriptulum 1|24 uncia scrupula scriptulum romanobol 1|2 scrupula romanaspound 4210 grain # Old pound based on bronze coinage, the # earliest money of Rome BC 338 to BC 268. !endcategory !category egyptian "Egyptian Measures" # Egyptian length measure egyptianroyalcubit 20.63 in # plus or minus .2 in egyptianpalm 1|7 egyptianroyalcubit egyptiandigit 1|4 egyptianpalm egyptianshortcubit 6 egyptianpalm doubleremen 29.16 in # Length of the diagonal of a square with remendigit 1|40 doubleremen # side length of 1 royal egyptian cubit. # This is divided into 40 digits which are # not the same size as the digits based on # the royal cubit. !endcategory !category greek "Greek Measures" # Greek length measures greekfoot 12.45 in # Listed as being derived from the greekfeet greekfoot # Egyptian Royal cubit in [11]. It is greekcubit 1.5 greekfoot # said to be 3|5 of a 20.75 in cubit. pous greekfoot podes greekfoot orguia 6 greekfoot greekfathom orguia stadion 100 orguia akaina 10 greekfeet plethron 10 akaina greekfinger 1|16 greekfoot homericcubit 20 greekfingers # Elbow to end of knuckles. shortgreekcubit 18 greekfingers # Elbow to start of fingers. ionicfoot 296 mm doricfoot 326 mm olympiccubit 25 remendigit # These olympic measures were not as olympicfoot 2|3 olympiccubit # common as the other greek measures. olympicfinger 1|16 olympicfoot # They were used in agriculture. olympicfeet olympicfoot olympicdakylos olympicfinger olympicpalm 1|4 olympicfoot olympicpalestra olympicpalm olympicspithame 3|4 foot olympicspan olympicspithame olympicbema 2.5 olympicfeet olympicpace olympicbema olympicorguia 6 olympicfeet olympicfathom olympicorguia olympiccord 60 olympicfeet olympicamma olympiccord olympicplethron 100 olympicfeet olympicstadion 600 olympicfeet # Greek capacity measure greekkotyle 270 ml # This approximate value is obtained xestes 2 greekkotyle # from two earthenware vessels that khous 12 greekkotyle # were reconstructed from fragments. metretes 12 khous # The kotyle is a day's corn ration choinix 4 greekkotyle # for one man. hekteos 8 choinix medimnos 6 hekteos # Greek weight. Two weight standards were used, an Aegina standard based # on the Beqa shekel and an Athens (attic) standard. aeginastater 192 grain # Varies up to 199 grain aeginadrachmae 1|2 aeginastater aeginaobol 1|6 aeginadrachmae aeginamina 50 aeginastaters aeginatalent 60 aeginamina # Supposedly the mass of a cubic foot # of water (whichever foot was in use) atticstater 135 grain # Varies 134-138 grain atticdrachmae 1|2 atticstater atticobol 1|6 atticdrachmae atticmina 50 atticstaters attictalent 60 atticmina # Supposedly the mass of a cubic foot # of water (whichever foot was in use) !endcategory !category northern_cubic "Northern Cubic and Foot" # "Northern" cubit and foot. This was used by the pre-Aryan civilization in # the Indus valley. It was used in Mesopotamia, Egypt, North Africa, China, # central and Western Europe until modern times when it was displaced by # the metric system. northerncubit 26.6 in # plus/minus .2 in northernfoot 1|2 northerncubit sumeriancubit 495 mm kus sumeriancubit sumerianfoot 2|3 sumeriancubit assyriancubit 21.6 in assyrianfoot 1|2 assyriancubit assyrianpalm 1|3 assyrianfoot assyriansusi 1|20 assyrianpalm susi assyriansusi persianroyalcubit 7 assyrianpalm !endcategory !category arabic "Arabic Measures" # Arabic measures. The arabic standards were meticulously kept. Glass weights # accurate to .2 grains were made during AD 714-900. hashimicubit 25.56 in # Standard of linear measure used # in Persian dominions of the Arabic # empire 7-8th cent. Is equal to two # French feet. blackcubit 21.28 in arabicfeet 1|2 blackcubit arabicfoot arabicfeet arabicinch 1|12 arabicfoot arabicmile 4000 blackcubit silverdirhem 45 grain # The weights were derived from these two tradedirhem 48 grain # units with two identically named systems # used for silver and used for trade purposes silverkirat 1|16 silverdirhem silverwukiyeh 10 silverdirhem silverrotl 12 silverwukiyeh arabicsilverpound silverrotl tradekirat 1|16 tradedirhem tradewukiyeh 10 tradedirhem traderotl 12 tradewukiyeh arabictradepound traderotl !endcategory !category misc_ancient "Misc. ancient units" # Miscellaneous ancient units parasang 3.5 mile # Persian unit of length usually thought # to be between 3 and 3.5 miles biblicalcubit 21.8 in hebrewcubit 17.58 in li 10|27.8 mile # Chinese unit of length # 100 li is considered a day's march liang 11|3 oz # Chinese weight unit !endcategory !category medieval_time "Medieval time units" # Medieval time units. According to the OED, these appear in Du Cange # by Papias. timepoint 1|5 hour # also given as 1|4 timeminute 1|10 hour timeostent 1|60 hour timeounce 1|8 timeostent timeatom 1|47 timeounce !endcategory !category jeweler_grains "Jeweler grains" # Given in [15], these subdivisions of the grain were supposedly used # by jewelers. The mite may have been used but the blanc could not # have been accurately measured. mite 1|20 grain droit 1|24 mite periot 1|20 droit blanc 1|24 periot !endcategory !category us_default "Aliases for US units" # # Localization # hundredweight ushundredweight ton uston scruple apscruple fluidounce usfluidounce gallon usgallon bushel usbushel quarter quarterweight cup uscup tablespoon ustablespoon teaspoon usteaspoon minim minimvolume pony ponyvolume firkin usfirkin hogshead ushogshead # hundredweight brhundredweight # ton brton # scruple brscruple # fluidounce brfluidounce # gallon brgallon # bushel brbushel # quarter brquarter # chaldron brchaldron # cup brcup # teacup brteacup # tablespoon brtablespoon # teaspoon brteaspoon # penny brpenny # minim minimnote # pony brpony # grand brgrand # firkin brfirkin # hogshead brhogshead !endcategory !category unicode "Unicode aliases" ⅛- 1|8 ¼- 1|4 ⅜- 3|8 ½- 1|2 ⅝- 5|8 ¾- 3|4 ⅞- 7|8 ⅙- 1|6 ⅓- 1|3 ⅔- 2|3 ⅚- 5|6 ⅕- 1|5 ⅖- 2|5 ⅗- 3|5 ⅘- 4|5 ⅐- 1|7 ⅑- 1|9 ⅒- 1|10 ℯ 2.71828182845904523536 #exp(1) # U+212F, base of natural log e ℯ µ- micro # micro sign U+00B5 μ- micro # small mu U+03BC ångström angstrom Å angstrom # angstrom symbol U+212B Å angstrom # A with ring U+00C5 röntgen roentgen #°C degC #°F degF °K K # °K is incorrect notation °R degR ° degree #℃ degC #℉ degF K K # Kelvin symbol, U+212A ℓ liter # unofficial abbreviation used in some places Ω ohm # Ohm symbol U+2126 ℧ mho ʒ dram # U+0292 ℈ scruple ℥ ounce ℔ lb ℎ planck_constant ℏ hbar ħ hbar ‰ 1|1000 ‱ 1|10000 #′ ' # U+2032 #″ " # U+2033 # # Square unicode symbols starting at U+3371 # ㍱ hPa ㍲ da ㍳ au ㍴ bar # ㍵ oV??? ㍶ pc #㍷ dm invalid on Mac #㍸ dm^2 invalid on Mac #㍹ dm^3 invalid on Mac ㎀ pA ㎁ nA ㎂ µA ㎃ mA ㎄ kA ㎅ kB ㎆ MB ㎇ GB ㎈ cal ㎉ kcal ㎊ pF ㎋ nF ㎌ µF ㎍ µg ㎎ mg ㎏ kg ㎐ Hz ㎑ kHz ㎒ MHz ㎓ GHz ㎔ THz ㎕ µL ㎖ mL ㎗ dL ㎘ kL ㎙ fm ㎚ nm ㎛ µm ㎜ mm ㎝ cm ㎞ km ㎟ mm^2 ㎠ cm^2 ㎡ m^2 ㎢ km^2 ㎣ mm^3 ㎤ cm^3 ㎥ m^3 ㎦ km^3 ㎧ m/s ㎨ m/s^2 ㎩ Pa ㎪ kPa ㎫ MPa ㎬ GPa ㎭ rad ㎮ rad/s ㎯ rad/s^2 ㎰ ps ㎱ ns ㎲ µs ㎳ ms ㎴ pV ㎵ nV ㎶ µV ㎷ mV ㎸ kV ㎹ MV ㎺ pW ㎻ nW ㎼ µW ㎽ mW ㎾ kW ㎿ MW ㏀ kΩ ㏁ MΩ ㏃ Bq ㏄ cc ㏅ cd ㏆ C/kg #㏈() dB ㏉ Gy ㏊ ha # ㏋ HP?? ㏌ in # ㏍ KK?? # ㏎ KM??? ㏏ kt ㏐ lm # ㏑ ln # ㏒ log ㏓ lx ㏔ mb ㏕ mil ㏖ mol #㏗() pH ㏙ ppm # ㏚ PR??? ㏛ sr ㏜ Sv ㏝ Wb #㏞ V/m Invalid on Mac #㏟ A/m Invalid on Mac #㏿ gal Invalid on Mac !endcategory ############################################################################# # # # Substances # # # ############################################################################# !category subst_compounds "Compounds" water { density mass gram / volume cm^3 pressure_column pressure gram force cm^-2 / column cm specific_heat specific_energy calorie g^-1 / temperature K fusion_heat fusion_energy 79.8 calorie / fusion_mass gram vaporization_heat vaporization_energy 1160 J / vaporization_mass gram pressure_column_0C pressure_0C 0.99987 force gram cm^-2 / column_0C cm pressure_column_5C pressure_5C 0.99999 force gram cm^-2 / column_5C cm pressure_column_10C pressure_10C 0.99973 force gram cm^-2 / column_10C cm pressure_column_15C pressure_15C 0.99913 force gram cm^-2 / column_15C cm pressure_column_18C pressure_18C 0.99862 force gram cm^-2 / column_18C cm pressure_column_20C pressure_20C 0.99823 force gram cm^-2 / column_20C cm pressure_column_25C pressure_25C 0.99707 force gram cm^-2 / column_25C cm pressure_column_50C pressure_50C 0.98807 force gram cm^-2 / column_50C cm pressure_column_100C pressure_100C 0.95838 force gram cm^-2 / column_100C cm } H2O water wc pressure_column of water mmH2O pressure of mm water inH2O pressure of inch water ammonia { specific_heat specific_energy 4.6 J g^-1 / temperature K } NH3 ammonia freon { ?? R-12 at 0 degrees Fahrenheit. specific_heat specific_energy 0.91 J g^-1 / temperature K } tissue { specific_heat specific_energy 3.5 J g^-1 / temperature K } diamond { specific_heat specific_energy 0.5091 J g^-1 / temperature K } granite { specific_heat specific_energy 0.79 J g^-1 / temperature K } graphite { specific_heat specific_energy 0.71 J g^-1 / temperature K } ice { specific_heat specific_energy 2.11 J g^-1 / temperature K } asphalt { specific_heat specific_energy 0.92 J g^-1 / temperature K } brick { specific_heat specific_energy 0.84 J g^-1 / temperature K } concrete { specific_heat specific_energy 0.88 J g^-1 / temperature K } glass_silica { specific_heat specific_energy 0.84 J g^-1 / temperature K } glass_flint { specific_heat specific_energy 0.503 J g^-1 / temperature K } glass_pyrex { specific_heat specific_energy 0.753 J g^-1 / temperature K } gypsum { specific_heat specific_energy 1.09 J g^-1 / temperature K } marble { specific_heat specific_energy 0.88 J g^-1 / temperature K } sand { specific_heat specific_energy 0.835 J g^-1 / temperature K } soil { specific_heat specific_energy 0.835 J g^-1 / temperature K } !endcategory !category particles "Fundamental particles" # # Fundamental particles # # particle wavelengths: the compton wavelength of a particle is # defined as h / m c where m is the mass of the particle. electron { ?? Uncertainty is 1.6 x 10^-14 u. 2018 CODATA recommended values mass const electron_mass 5.48579909065e-4 u ?? Defined as exactly 1.602 176 634 × 10^–19 C. ?? 26th CGPM (2018, Resolution 1; CR, 210) charge const electron_charge 1.602176634e-19 C radius const electron_radius ((1/4 pi epsilon0) \ charge^2 / mass c^2) wavelength const electron_wavelength planck_constant / mass c ?? Uncertainty is 2.8 x 10^-33 J/T. 2018 CODATA recommended values magnetic_moment const electron_moment -9.2847647043e-24 J/T } electronmass mass of electron electroncharge charge of electron m_e electronmass proton { ?? Uncertainty is 5.3 x 10^-11 u. 2018 CODATA recommended values mass const proton_mass 1.007276466621 u wavelength const proton_wavelength planck_constant / mass c ?? Uncertainty is 1.9 x 10^-19 m. 2018 CODATA recommended values charge_radius const proton_radius 0.8414e-15 m ?? Uncertainty is 6.0 x 10^-36 J/T. 2018 CODATA recommended values magnetic_moment const proton_moment 1.41060679736e-26 J/T } m_p mass of proton neutron { ?? Uncertainty is 4.9 x 10^-10 u. 2018 CODATA recommended values mass const neutron_mass 1.00866491595 u wavelength const neutron_wavelength planck_constant / mass c ?? Uncertainty is 2.3 x 10^-33 J/T. 2018 CODATA recommended values magnetic_moment const neutron_moment -0.96623651e-26 J/T } m_n mass of neutron deuteron { ?? Uncertainty 4.0 x 10^-11 u. 2018 CODATA recommended values mass const deuteron_mass 2.013553212745 u ?? Uncertainty is 7.4 x 10^-19 m. 2018 CODATA recommended values charge_radius const deuteron_radius 2.12799e-15 m ?? Uncertainty is 1.1 x 10^-35 J/T. 2018 CODATA recommended values magnetic_moment const deuteron_moment 4.330735094e-27 J/T } m_d mass of deuteron muon { ?? Uncertainty is 2.5 x 10^-9 u. 2018 CODATA recommended values mass const muon_mass 0.1134289259 u ?? Uncertainty is 1.0 x 10^-33 J/T. 2018 CODATA recommended values magnetic_moment const muon_moment -4.49044830e-26 J/T } m_mu mass of muon helion { ?? Uncertainty is 9.7 x 10^-11 u. 2018 CODATA recommended values mass const helion_mass 3.014932247175 u ?? Uncertainty is 1.3 x 10^-34 J/T. 2018 CODATA recommended values magnetic_moment const helion_moment -1.074617532e-26 J/T } tauparticle { ?? Uncertainty is 0.00013 u. 2018 CODATA recommended values mass const tau_mass 1.90754 u } alphaparticle { ?? Uncertainty is 6.3 x 10^-11 u. 2018 CODATA recommended values mass const alpha_mass 4.001506179127 u } triton { ?? Uncertainty is 1.2 x 10^-10. 2018 CODATA recommended values mass const triton_mass 3.01550071621 u ?? Uncertainty is 3.0 x 10^-35 J/T. 2018 CODATA recommended values magnetic_moment const triton_moment 1.5046095202e-26 J/T } light { ?? Speed that light travels in a vacuum. ?? Defined as exactly 299 792 458 m/s. ?? 26th CGPM (2018, Resolution 1; CR, 210). speed const light_speed 2.99792458e8 m/s } !endcategory !category celestial "Celestial bodies" # # Celestial bodies # # Sidereal years from http://ssd.jpl.nasa.gov/phys_props_planets.html. Data # was updated in May 2001 based on the 1992 Explanatory Supplement to the # Astronomical Almanac and the mean longitude rates. Apparently the table of # years in that reference is incorrect. # The following are masses for planetary systems, not just the planet itself. # The comments give the uncertainty in the denominators. As noted above, # masses are given relative to the solarmass because this is more accurate. # The conversion to SI is uncertain because of uncertainty in G, the # gravitational constant. # # Values are from http://ssd.jpl.nasa.gov/astro_constants.html # Mean radius from http://ssd.jpl.nsaa.gov/phys_props_planets.html which in # turn cites Global Earth Physics by CF Yoder, 1995. sun { mass const solar_mass 1.9891e30 kg ?? Average earth-sun distance distance const sun_distance 1.0000010178 au ?? Earth-sun distance at periphelion distance_near const sun_distance_near 1.471e11 m ?? Earth-sun distance at aphelion distance_far const sun_distance_far 1.521e11 m radius_equatorial const sun_radius 695700 km volume const sun_volume 1.41e18 km^3 ?? Source: http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html luminosity const solar_luminosity 384.6e24 W # Some luminance data from the IES Lighting Handbook, 8th ed, 1993 ?? Clear sky. illum_zenith const sun_illum_zenith 100e3 lux illum_overcast const sun_illum_overcast 10e3 lux luminance_zenith const sun_lum_zenith 1.6e9 cd/m^2 luminance_horizon const sun_lum_horizon 6e6 cd/m^2 ?? Average, clear sky. luminance_clear const sun_lum_clear 8000 cd/m^2 ?? Average, overcast sky. luminance_overcast const sun_lum_overcast 2000 cd/m^2 } solarmass mass of sun sunmass solarmass sundist distance of sun solarluminosity luminosity of sun mercury_planet { ?? ±250 mass const mercury_mass solarmass / 6023600 mass_old const mercury_old 0.33022e24 kg radius const mercury_radius 2440 km volume const mercury_volume 6.083e10 km^3 sidereal_day const mercury_day 58.6462 day year const mercury_year 0.2408467 julianyear } venus { ?? ± 0.06 mass const venus_mass solarmass / 408523.71 mass_old const venus_old 4.8690e24 kg radius const venus_radius 6051.84 km volume const venus_volume 9.2843e11 km^3 ?? Retrograde. sidereal_day const venus_day 243.01 day year const venus_year 0.61519726 julianyear } ?? ±0.02 earthmoonmass solarmass / 328900.56 ?? ±3e-9 moonearthmassratio 0.012300034 earth { mass const earth_mass earthmoonmass / ( 1 + moonearthmassratio) radius const earth_radius 6371.01 km volume const earth_volume 1.08321e12 km^3 sidereal_day const earth_day siderealday year const earth_year siderealyear } moon { ?? Average earth-moon distance. mass const moon_mass moonearthmassratio mass of earth radius const moon_radius 1737.1 km volume const moon_volume 2.1958e10 km^3 distance const moon_dist 3.844e8 m gravity const moon_gravity 1.62 m/s^2 luminance const moon_luminance 2500 cd/m^2 } mars { ?? ±9 mass const mars_mass solarmass / 3098708 mass_old const mars_old 0.64191e24 kg radius const mars_radius 3389.92 km volume const mars_volume 1.6318e11 km^3 sidereal_day const mars_day 1.02595675 day year const mars_year 1.8808476 julianyear } jupiter { ?? ±0.0008 mass const jupiter_mass solarmass / 1047.3486 mass_old const jupiter_old 1898.8e24 kg radius const jupiter_radius 69911 km volume const jupiter_volume 1.4313e15 km^3 sidereal_day const jupiter_day 0.41354 day year const jupiter_year 11.862615 julianyear } saturn { ?? ±0.018 mass const saturn_mass solarmass / 3497.898 mass_old const saturn_old 568.5e24 kg radius const saturn_radius 58232 km volume const saturn_volume 8.2713e14 km^3 sidereal_day const saturn_day 0.4375 day year const saturn_year 29.447498 julianyear } uranus { ?? ±0.03 mass const uranus_mass solarmass / 22902.98 mass_old const uranus_old 86.625e24 kg radius const uranus_radius 25362 km volume const uranus_volume 6.833e13 km^3 ?? Retrograde. sidereal_day const uranus_day 0.65 day year const uranus_year 84.016846 julianyear } neptune { ?? ±0.04 mass const neptune_mass solarmass / 19412.24 mass_old const neptune_old 102.78e24 kg radius const neptune_radius 24624 km volume const neptune_volume 6.254e13 km^3 sidereal_day const neptune_day 0.768 day year const neptune_year 164.79132 julianyear } pluto { ?? ±0.07e8 mass const pluto_mass solarmass / 1.35e8 mass_old const pluto_old 0.015e24 kg radius const pluto_radius 1151 km ?? ±0.071e9 km^3 volume const pluto_volume 7.006e9 km^3 sidereal_day const pluto_day 6.3867 day year const pluto_year 247.92065 julianyear } !endcategory !category fuels "Fuels" # # Energy densities of various fuels # # Most of these fuels have varying compositions or qualities and hence their # actual energy densities vary. These numbers are hence only approximate. # # E1. http://bioenergy.ornl.gov/papers/misc/energy_conv.html # E2. http://www.aps.org/policy/reports/popa-reports/energy/units.cfm # E3. http://www.ior.com.au/ecflist.html oil { ?? Ton oil equivalent. A conventional ?? value for the energy released by ?? burning one metric ton of oil. [18,E2] ?? Note that energy per mass of petroleum ?? products is fairly constant. ?? Variations in volumetric energy ?? density result from variations in the ?? density (kg/m^3) of different fuels. ?? This definition is given by the ?? IEA/OECD. specific_energy energy 1e10 cal_IT / mass ton } tonoil energy of ton oil toe tonoil ?? Conventional value for barrel of crude ?? oil [E2]. Actual range is 5.6 - 6.3. barreloil 5.8 Mbtu coal { ?? Energy in metric ton coal from [18]. ?? This is a nominal value which ?? is close to the heat content ?? of coal used in the 1950's. specific_energy energy 7e9 cal_IT / mass ton specific_energy_bituminous energy_bituminous 27 GJ / mass_bituminous tonne specific_energy_lignite energy_lignite 15 GJ / mass_lignite tonne specific_energy_us energy_us 22 GJ / mass_us uston } naturalgas { ?? Energy content of natural gas. HHV ?? is for Higher Heating Value and ?? includes energy from condensation ?? combustion products. LHV is for Lower ?? Heating Value and excludes these. ?? American publications typically report ?? HHV whereas European ones report LHV. energy_density_HHV energy_HHV 1027 btu / volume_HHV ft^3 energy_density_LHV energy_LHV 930 btu / volume_LHV ft^3 } charcoal { specific_energy energy 30 GJ / mass tonne } wood { ?? HHV, a cord weights about a tonne. specific_energy_dry energy_dry 20 GJ / mass_dry tonne ?? 20% moisture content. specific_energy_airdry energy_airdry 15 GJ / mass_airdry tonne specific_heat specific_energy 1.7 J g^-1 / temperature K } ethanol { energy_density_HHV energy_HHV 84000 btu / volume_HHV usgallon energy_density_LHV energy_LHV 75700 btu / volume_LHV usgallon specific_heat specific_energy 2.3 J g^-1 / temperature K } diesel { energy_density energy 130500 btu / volume usgallon } gasoline { energy_density_LHV energy_LHV 115000 btu / volume_LHV usgallon energy_density_HHV energy_HHV 125000 btu / volume_HHV usgallon specific_heat specific_energy 2.22 J g^-1 / temperature K } heating_oil { energy_density energy 37.3 MJ / volume liter } fueloil { ?? Low sulphur. energy_density energy 39.7 MJ / volume liter } propane { energy_density energy 93.3 MJ / volume m^3 } butane { energy_density energy 124 MJ / volume m^3 } !endcategory !category cooking "Cooking ingredients" # densities of cooking ingredients from The Cake Bible by Rose Levy Beranbaum # so you can convert '2 cups sugar' to grams, for example, or in the other # direction grams could be converted to 'cup flour_scooped'. butter { density mass 8 oz / volume uscup } butter_clarified { density mass 6.8 oz / volume uscup } cocoa_butter { density mass 9 oz / volume uscup } ?? Vegetable shortening. shortening { density mass 6.75 oz / volume uscup } vegetable_oil { density mass 7.5 oz / volume uscup } olive_oil { density mass 0.918 g / volume cm^3 specific_heat specific_energy 1.97 J g^-1 / temperature K } # The density of flour depends on the # measuring method. "Scooped", or # "dip and sweep" refers to dipping a # measure into a bin, and then sweeping # the excess off the top. "Spooned" # means to lightly spoon into a measure # and then sweep the top. Sifted means # sifting the flour directly into a # measure and then sweeping the top. cakeflour { density_sifted mass_sifted 3.5 oz / volume_sifted uscup density_spooned mass_spooned 4 oz / volume_spooned uscup density_scooped mass_scooped 4.5 oz / volume_scooped uscup } flour { density_sifted mass_sifted 4 oz / volume_sifted uscup density_spooned mass_spooned 4.25 oz / volume_spooned uscup density_scooped mass_scooped 5 oz / volume_scooped uscup } breadflour { density_sifted mass_sifted 4.25 oz / volume_sifted uscup density_spooned mass_spooned 4.5 oz / volume_spooned uscup density_scooped mass_scooped 5.5 oz / volume_scooped uscup } cornstarch { density mass 120 grams / volume uscup } ?? Alkalized Dutch processed cocoa. dutchcocoa { density_sifted mass_sifted 75 g / volume_sifted uscup density_spooned mass_spooned 92 g / volume_spooned uscup density_scooped mass_scooped 95 g / volume_scooped uscup } ?? Non-alkalized cocoa. cocoa { density_sifted mass_sifted 75 g / volume_sifted uscup density_spooned mass_spooned 82 g / volume_spooned uscup density_scooped mass_scooped 95 g / volume_scooped uscup } heavycream { density mass 232 g / volume uscup } milk { density mass 242 g / volume uscup } sourcream { density mass 242 g / volume uscup } molasses { density mass 11.25 oz / volume uscup } cornsyrup { density mass 11.5 oz / volume uscup } honey { density mass 11.75 oz / volume uscup } sugar { density mass 200 g / volume uscup specific_heat specific_energy 1.244 J g^-1 / temperature K } powdered_sugar { density mass 4 oz / volume uscup } brownsugar_light { ?? Packed. density mass 217 g / volume uscup } brownsugar_dark { density mass 239 g / volume uscup } baking_powder { density mass 4.6 grams / volume ustsp } salt { density mass 6 g / volume ustsp } koshersalt { ?? Diamond Crystal kosher salt density_dc dc_mass 2.8 g / dc_volume ustsp ?? Morton kosher salt density_morton morton_mass 4.8 g / morton_volume ustsp } ?? USA large egg. egg { mass_shelled const egg_shelled 50 grams mass_white const egg_white 30 grams mass_yolk const egg_yolk 18.6 grams volume const egg_volume (3 ustbsp + 1|2 ustsp) volume_white const egg_white 2 tbsp volume_yolk const egg_yolk 3.5 ustsp } !endcategory !category elements "Atomic elements" # # Atomic weights. The atomic weight of an element is the ratio of the mass of # a mole of the element to 1|12 of a mole of Carbon 12. The Standard Atomic # Weights apply to the elements as they occur naturally on earth. Elements # which do not occur naturally or which occur with wide isotopic variability do # not have Standard Atomic Weights. For these elements, the atomic weight is # based on the longest lived isotope, as marked in the comments. In some # cases, the comment for these entries also gives a number which is an atomic # weight for a different isotope that may be of more interest than the longest # lived isotope. # #!symbol actinium Ac # conflicts with acetyl actinium { atomic_number const actinium_atomic_number 89 molar_mass mass 227.0278 g / amount mol } !symbol aluminum Al aluminum { atomic_number const aluminum_atomic_number 13 molar_mass mass 26.981539 g / amount mol specific_heat specific_energy 0.91 J g^-1 / temperature K } aluminium aluminum americium { atomic_number const aluminum_atomic_number 95 ?? Longest lived. 241.06 molar_mass mass 243.0614 g / amount mol } !symbol antimony Sb antimony { atomic_number const antimony_atomic_number 51 molar_mass mass 121.760 g / amount mol specific_heat specific_energy 0.21 J g^-1 / temperature K } !symbol argon Ar argon { atomic_number const argon_atomic_number 18 molar_mass mass 39.948 g / amount mol specific_heat specific_energy 0.5203 J g^-1 / temperature K } !symbol arsenic As arsenic { atomic_number const arsenic_atomic_number 33 molar_mass mass 74.92159 g / amount mol } astatine { atomic_number const astatine_atomic_number 85 ?? Longest lived. molar_mass mass 209.9871 g / amount mol } !symbol barium Ba barium { atomic_number const barium_atomic_number 56 molar_mass mass 137.327 g / amount mol specific_heat specific_energy 0.20 J g^-1 / temperature K } berkelium { atomic_number const berkelium_atomic_number 97 ?? Longest lived. 249.08 molar_mass mass 247.0703 g / amount mol } !symbol beryllium Be beryllium { atomic_number const beryllium_atomic_number 4 molar_mass mass 9.012182 g / amount mol specific_heat specific_energy 1.83 J g^-1 / temperature K } !symbol bismuth Bi bismuth { atomic_number const bismuth_atomic_number 83 molar_mass mass 208.98037 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } bohrium { atomic_number const bohrium_atomic_number 107 molar_mass mass 272.13826 g / amount mol } !symbol boron B boron { atomic_number const boron_atomic_number 5 molar_mass mass 10.811 g / amount mol } !symbol bromine Br bromine { atomic_number const bromine_atomic_number 35 molar_mass mass 79.904 g / amount mol } !symbol cadmium Cd cadmium { atomic_number const cadmium_atomic_number 48 molar_mass mass 112.411 g / amount mol specific_heat specific_energy 0.23 J g^-1 / temperature K } !symbol calcium Ca calcium { atomic_number const calcium_atomic_number 20 molar_mass mass 40.078 g / amount mol } californium { atomic_number const californium_atomic_number 98 ?? Longest lived. 252.08 molar_mass mass 251.0796 g / amount mol } !symbol carbon C carbon { atomic_number const carbon_atomic_number 6 molar_mass mass 12.011 g / amount mol } !symbol cerium Ce cerium { atomic_number const cerium_atomic_number 58 molar_mass mass 140.115 g / amount mol } !symbol cesium Cs cesium { atomic_number const cesium_atomic_number 55 molar_mass mass 132.90543 g / amount mol specific_heat specific_energy 0.24 J g^-1 / temperature K } !symbol chlorine Cl chlorine { atomic_number const chlorine_atomic_number 17 molar_mass mass 35.4527 g / amount mol } !symbol chromium Cr chromium { atomic_number const chromium_atomic_number 24 molar_mass mass 51.9961 g / amount mol specific_heat specific_energy 0.46 J g^-1 / temperature K } !symbol cobalt Co cobalt { atomic_number const cobalt_atomic_number 27 molar_mass mass 58.93320 g / amount mol specific_heat specific_energy 0.42 J g^-1 / temperature K } copernicium { atomic_number const copernicium_atomic_number 112 molar_mass mass 285.17712 g / amount mol } !symbol copper Cu copper { atomic_number const copper_atomic_number 29 molar_mass mass 63.546 g / amount mol specific_heat specific_energy 0.39 J g^-1 / temperature K } curium { atomic_number const curium_atomic_number 96 molar_mass mass 247.0703 g / amount mol } darmstadtium { atomic_number const darmstadtium_atomic_number 110 molar_mass mass 281.16451 g / amount mol } !symbol deuterium D deuterium { molar_mass mass 2.0141017778 g / amount mol } dubnium { atomic_number const dubnium_atomic_number 105 molar_mass mass 268.12567 g / amount mol } !symbol dysprosium Dy dysprosium { atomic_number const dysprosium_atomic_number 66 molar_mass mass 162.50 g / amount mol } einsteinium { atomic_number const einsteinium_atomic_number 99 ?? Longest lived. molar_mass mass 252.083 g / amount mol } !symbol erbium Er erbium { atomic_number const erbium_atomic_number 68 molar_mass mass 167.26 g / amount mol } !symbol europium Eu europium { atomic_number const europium_atomic_number 63 molar_mass mass 151.965 g / amount mol } fermium { atomic_number const fermium_atomic_number 100 ?? Longest lived. molar_mass mass 257.0951 g / amount mol } flerovium { atomic_number const flerovium_atomic_number 114 molar_mass mass 289.19042 g / amount mol } !symbol fluorine F fluorine { atomic_number const fluorine_atomic_number 9 molar_mass mass 18.9984032 g / amount mol } francium { atomic_number const francium_atomic_number 87 ?? Longest lived molar_mass mass 223.0197 g / amount mol } !symbol gadolinium Gd gadolinium { atomic_number const gadolinium_atomic_number 64 molar_mass mass 157.25 g / amount mol } !symbol gallium Ga gallium { atomic_number const gallium_atomic_number 31 molar_mass mass 69.723 g / amount mol specific_heat specific_energy 0.37 J g^-1 / temperature K } !symbol germanium Ge germanium { atomic_number const germanium_atomic_number 32 molar_mass mass 72.61 g / amount mol specific_heat specific_energy 0.32 J g^-1 / temperature K } !symbol gold Au gold { atomic_number const gold_atomic_number 79 molar_mass mass 196.96654 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol hafnium Hf hafnium { atomic_number const hafnium_atomic_number 72 molar_mass mass 178.49 g / amount mol specific_heat specific_energy 0.14 J g^-1 / temperature K } hassium { atomic_number const hassium_atomic_number 108 molar_mass mass 270.13429 g / amount mol } !symbol helium He helium { atomic_number const helium_atomic_number 2 molar_mass mass 4.002602 g / amount mol } !symbol holmium Ho holmium { atomic_number const holmium_atomic_number 67 molar_mass mass 164.93032 g / amount mol specific_heat specific_energy 5.1932 J g^-1 / temperature K } !symbol hydrogen H hydrogen { atomic_number const hydrogen_atomic_number 1 molar_mass mass 1.00794 g / amount mol specific_heat specific_energy 14.3 J g^-1 / temperature K } !symbol indium In indium { atomic_number const indium_atomic_number 49 molar_mass mass 114.818 g / amount mol specific_heat specific_energy 0.24 J g^-1 / temperature K } !symbol iodine I iodine { atomic_number const iodine_atomic_number 53 molar_mass mass 126.90447 g / amount mol specific_heat specific_energy 2.15 J g^-1 / temperature K } !symbol iridium Ir iridium { atomic_number const iridium_atomic_number 77 molar_mass mass 192.217 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol iron Fe iron { atomic_number const iron_atomic_number 26 molar_mass mass 55.845 g / amount mol specific_heat specific_energy 0.45 J g^-1 / temperature K } !symbol krypton Kr krypton { atomic_number const krypton_atomic_number 36 molar_mass mass 83.80 g / amount mol } !symbol lanthanum La lanthanum { atomic_number const lanthanum_atomic_number 57 molar_mass mass 138.9055 g / amount mol specific_heat specific_energy 0.195 J g^-1 / temperature K } lawrencium { atomic_number const lawrencium_atomic_number 103 ?? Longest lived. molar_mass mass 262.11 g / amount mol } !symbol lead Pb lead { atomic_number const lead_atomic_number 82 molar_mass mass 207.2 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol lithium Li lithium { atomic_number const lithium_atomic_number 3 molar_mass mass 6.941 g / amount mol specific_heat specific_energy 3.57 J g^-1 / temperature K } livermorium { atomic_number const livermorium_atomic_number 116 molar_mass mass 293.20449 g / amount mol } !symbol lutetium Lu lutetium { atomic_number const lutetium_atomic_number 71 molar_mass mass 174.967 g / amount mol specific_heat specific_energy 0.15 J g^-1 / temperature K } !symbol magnesium Mg magnesium { atomic_number const magnesium_atomic_number 12 molar_mass mass 24.3050 g / amount mol specific_heat specific_energy 1.05 J g^-1 / temperature K } !symbol manganese Mn manganese { atomic_number const manganese_atomic_number 25 molar_mass mass 54.93805 g / amount mol specific_heat specific_energy 0.48 J g^-1 / temperature K } meitnerium { atomic_number const meitnerium_atomic_number 109 molar_mass mass 276.15159 g / amount mol } mendelevium { atomic_number const mendelevium_atomic_number 101 ?? Longest lived molar_mass mass 258.10 g / amount mol } !symbol mercury Hg mercury { atomic_number const mercury_atomic_number 80 molar_mass mass 200.59 g / amount mol specific_heat specific_energy 0.14 J g^-1 / temperature K density mass 13.5951 gram / volume cm^3 pressure_column pressure 13.5951 gram force cm^-2 / column cm # These units, when used to form # pressure measures, are not accurate # because of considerations of the # revised practical temperature scale. pressure_column_10C pressure_10C 13.5708 force gram cm^-2 / column_10C cm pressure_column_20C pressure_20C 13.5462 force gram cm^-2 / column_20C cm pressure_column_23C pressure_23C 13.5386 force gram cm^-2 / column_23C cm pressure_column_30C pressure_30C 13.5217 force gram cm^-2 / column_30C cm pressure_column_40C pressure_40C 13.4973 force gram cm^-2 / column_40C cm pressure_column_60F pressure_60F 13.5574 force gram cm^-2 / column_60F cm } Hg mercury mmHg pressure of mm mercury inHg pressure of inch mercury !symbol molybdenum Mo molybdenum { atomic_number const molybdenum_atomic_number 42 molar_mass mass 95.94 g / amount mol specific_heat specific_energy 0.25 J g^-1 / temperature K } !symbol moscovium Mc moscovium { atomic_number const moscovium_atomic_number 115 molar_mass mass 288.19274 g / amount mol } ununpentium moscovium !symbol neodymium Nd neodymium { atomic_number const neodymium_atomic_number 60 molar_mass mass 144.24 g / amount mol } !symbol neon Ne neon { atomic_number const neon_atomic_number 10 molar_mass mass 20.1797 g / amount mol } neptunium { atomic_number const neptunium_atomic_number 93 molar_mass mass 237.0482 g / amount mol } !symbol nickel Ni nickel { atomic_number const nickel_atomic_number 28 molar_mass mass 58.6934 g / amount mol specific_heat specific_energy 0.44 J g^-1 / temperature K } !symbol nihonium Nh nihonium { atomic_number const nihonium_atomic_number 113 molar_mass mass 284.17873 g / amount mol } ununtrium nihonium !symbol niobium Nb niobium { atomic_number const niobium_atomic_number 41 molar_mass mass 92.90638 g / amount mol } !symbol nitrogen N nitrogen { atomic_number const nitrogen_atomic_number 7 molar_mass mass 14.00674 g / amount mol } nobelium { atomic_number const nobelium_atomic_number 102 ?? Longest lived. molar_mass mass 259.1009 g / amount mol } !symbol oganesson Og oganesson { atomic_number const oganesson_atomic_number 118 molar_mass mass 294.21392 g / amount mol } ununoctium oganesson !symbol osmium Os osmium { atomic_number const osmium_atomic_number 76 molar_mass mass 190.23 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol oxygen O oxygen { atomic_number const oxygen_atomic_number 8 molar_mass mass 15.9994 g / amount mol } !symbol palladium Pa palladium { atomic_number const palladium_atomic_number 46 molar_mass mass 106.42 g / amount mol specific_heat specific_energy 0.24 J g^-1 / temperature K } !symbol phosphorus P phosphorus { atomic_number const phosphorus_atomic_number 15 molar_mass mass 30.973762 g / amount mol } !symbol platinum Pt platinum { atomic_number const platinum_atomic_number 78 molar_mass mass 195.08 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol plutonium Pu plutonium { atomic_number const plutonium_atomic_number 94 ?? Longest lived. 239.05 molar_mass mass 244.0642 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } polonium { atomic_number const polonium_atomic_number 84 ?? Longest lived. 209.98 molar_mass mass 208.9824 g / amount mol } !symbol potassium K potassium { atomic_number const potassium_atomic_number 19 molar_mass mass 39.0983 g / amount mol specific_heat specific_energy 0.75 J g^-1 / temperature K } !symbol praseodymium Pr praseodymium { atomic_number const praseodymium_atomic_number 59 molar_mass mass 140.90765 g / amount mol } promethium { atomic_number const promethium_atomic_number 61 ?? Longest lived. 146.92 molar_mass mass 144.9127 g / amount mol } protactinium { atomic_number const protactinium_atomic_number 91 molar_mass mass 231.03588 g / amount mol } radium { atomic_number const radium_atomic_number 88 molar_mass mass 226.0254 g / amount mol } radon { atomic_number const radon_atomic_number 86 ?? Longest lived. molar_mass mass 222.0176 g / amount mol } !symbol rhenium Re rhenium { atomic_number const rhenium_atomic_number 75 molar_mass mass 186.207 g / amount mol specific_heat specific_energy 0.14 J g^-1 / temperature K } !symbol rhodium Rh rhodium { atomic_number const rhodium_atomic_number 45 molar_mass mass 102.90550 g / amount mol specific_heat specific_energy 0.24 J g^-1 / temperature K } roentgenium { atomic_number const roentgenium_atomic_number 111 molar_mass mass 280.16514 g / amount mol } !symbol rubidium Rb rubidium { atomic_number const rubidium_atomic_number 37 molar_mass mass 85.4678 g / amount mol specific_heat specific_energy 0.36 J g^-1 / temperature K } !symbol ruthenium Ru ruthenium { atomic_number const ruthenium_atomic_number 44 molar_mass mass 101.07 g / amount mol specific_heat specific_energy 0.24 J g^-1 / temperature K } rutherfordium { atomic_number const rutherfordium_atomic_number 104 molar_mass mass 267.12179 g / amount mol } !symbol samarium Sm samarium { atomic_number const samarium_atomic_number 62 molar_mass mass 150.36 g / amount mol } !symbol scandium Sc scandium { atomic_number const scandium_atomic_number 21 molar_mass mass 44.955910 g / amount mol specific_heat specific_energy 0.57 J g^-1 / temperature K } seaborgium { atomic_number const seaborgium_atomic_number 106 molar_mass mass 271.13393 g / amount mol } !symbol selenium Se selenium { atomic_number const selenium_atomic_number 34 molar_mass mass 78.96 g / amount mol specific_heat specific_energy 0.32 J g^-1 / temperature K } !symbol silicon Si silicon { atomic_number const silicon_atomic_number 14 molar_mass mass 28.0855 g / amount mol specific_heat specific_energy 0.71 J g^-1 / temperature K } !symbol silver Ag silver { atomic_number const silver_atomic_number 47 molar_mass mass 107.8682 g / amount mol specific_heat specific_energy 0.23 J g^-1 / temperature K } !symbol sodium Na sodium { atomic_number const sodium_atomic_number 11 molar_mass mass 22.989768 g / amount mol specific_heat specific_energy 1.21 J g^-1 / temperature K } !symbol strontium Sr strontium { atomic_number const strontium_atomic_number 38 molar_mass mass 87.62 g / amount mol specific_heat specific_energy 0.30 J g^-1 / temperature K } !symbol sulfur S sulfur { atomic_number const sulfur_atomic_number 16 molar_mass mass 32.066 g / amount mol } sulphur sulfur !symbol tantalum Ta tantalum { atomic_number const tantalum_atomic_number 73 molar_mass mass 180.9479 g / amount mol specific_heat specific_energy 0.14 J g^-1 / temperature K } technetium { atomic_number const technetium_atomic_number 43 ?? Longest lived. 98.906 molar_mass mass 97.9072 g / amount mol } !symbol tellurium Te tellurium { atomic_number const tellurium_atomic_number 52 molar_mass mass 127.60 g / amount mol } !symbol tennessine Ts tennessine { atomic_number const tennessine_atomic_number 117 molar_mass mass 292.20746 g / amount mol } ununseptium tennessine !symbol terbium Tb terbium { atomic_number const terbium_atomic_number 65 molar_mass mass 158.92534 g / amount mol } !symbol thallium Tl thallium { atomic_number const thallium_atomic_number 81 molar_mass mass 204.3833 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol thorium Th thorium { atomic_number const thorium_atomic_number 90 molar_mass mass 232.0381 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol thullium Tm thullium { atomic_number const thullium_atomic_number 69 molar_mass mass 168.93421 g / amount mol } !symbol tin Sn tin { atomic_number const tin_atomic_number 50 molar_mass mass 118.710 g / amount mol specific_heat specific_energy 0.21 J g^-1 / temperature K } !symbol titanium Ti titanium { atomic_number const titanium_atomic_number 22 molar_mass mass 47.867 g / amount mol specific_heat specific_energy 0.54 J g^-1 / temperature K } !symbol tungsten W tungsten { atomic_number const tungsten_atomic_number 74 molar_mass mass 183.84 g / amount mol specific_heat specific_energy 0.13 J g^-1 / temperature K } !symbol uranium U uranium { atomic_number const uranium_atomic_number 92 molar_mass mass 238.0289 g / amount mol specific_heat specific_energy 0.12 J g^-1 / temperature K molar_mass_235 mass_235 235.0439299 g / amount_235 mol ?? Total energy from uranium fission. Actual efficiency of ?? nuclear power plants is around 30%-40%. Note also that some ?? reactors use enriched uranium around 3% U-235. Uranium during ?? processing or use may be in a compound of uranium oxide or ?? uranium hexafluoride, in which case the energy density would be ?? lower depending on how much uranium is in the compound. specific_energy_235_fission fission_energy 200 MeV / mass ((235.0439299 g/mol) / avogadro) } !symbol vanadium V vanadium { atomic_number const vanadium_atomic_number 23 molar_mass mass 50.9415 g / amount mol specific_heat specific_energy 0.39 J g^-1 / temperature K } !symbol xenon Xe xenon { atomic_number const xenon_atomic_number 54 molar_mass mass 131.29 g / amount mol } !symbol ytterbium Yb ytterbium { atomic_number const ytterbium_atomic_number 70 molar_mass mass 173.04 g / amount mol } !symbol yttrium Y yttrium { atomic_number const yttrium_atomic_number 39 molar_mass mass 88.90585 g / amount mol specific_heat specific_energy 0.30 J g^-1 / temperature K } !symbol zinc Zn zinc { atomic_number const zinc_atomic_number 30 molar_mass mass 65.39 g / amount mol specific_heat specific_energy 0.39 J g^-1 / temperature K } !symbol zirconium Zr zirconium { atomic_number const zirconium_atomic_number 40 molar_mass mass 91.224 g / amount mol specific_heat specific_energy 0.27 J g^-1 / temperature K } !endcategory !category air "Air" # The atmospheric composition listed is from NASA Earth Fact Sheet (accessed # 28 August 2015) # http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html # Numbers do not add up to exactly 100% due to roundoff and uncertainty Water # is highly variable, typically makes up about 1% ?? Average molecular weight of air. air 78.08 % nitrogen 2 \ + 20.95 % oxygen 2 \ + 9340 ppm argon \ + 400 ppm (carbon + oxygen 2) \ + 18.18 ppm neon \ + 5.24 ppm helium \ + 1.7 ppm (carbon + 4 hydrogen) \ + 1.14 ppm krypton \ + 0.55 ppm hydrogen 2 !endcategory !category organic_chem "Organic chemistry" # Various abbreviations used in organic chemistry. !symbol methyl Me methyl { molar_mass mass 15.03482 g / amount mol } !symbol ethyl Et ethyl { molar_mass mass 29.0617 g / amount mol } !symbol acetyl Ac acetyl { molar_mass mass 43.04522 g / amount mol } !symbol phenyl Ph phenyl { molar_mass mass 77.1057 g / amount mol } !endcategory !category bio_compounds "Biological compounds" # Biological or immunological activity of reference preparations. prolactin { # 4th International Standard for Prolactin, human, pituitary [WHO/BS/2016.2292] # biological_activity_density mass 3.2 µg / biological_activity 67 mIU } # Steroid hormones. progesterone C21H30O2 dehydroepiandrosterone C19H28O2 androstenediol C19H30O2 androstenedione C19H26O2 testosterone C19H28O2 dihydrotestosterone C19H30O2 estrone C18H22O2 estradiol C18H24O2 estriol C18H24O3 estetrol C18H24O4 androstenolone dehydroepiandrosterone androstanolone dihydrotestosterone oestrone estrone oestradiol estradiol oestriol estriol oestetrol estetrol !endcategory ############################################################################ # # The following units were in the unix units database but do not appear in # this file: # # wey used for cheese, salt and other goods. Measured mass or # waymass volume depending on what was measured and where the measuring # took place. A wey of cheese ranged from 200 to 324 pounds. # # sack No precise definition # # spindle The length depends on the type of yarn # # block Defined variously on different computer systems # # erlang A unit of telephone traffic defined variously. # Omitted because there are no other units for this # dimension. Is this true? What about CCS = 1/36 erlang? # Erlang is supposed to be dimensionless. One erlang means # a single channel occupied for one hour. # ############################################################################ # vim: set foldmethod=marker foldmarker=!category,!endcategory: