# $Id: udunits.dat,v 1.18 2006/09/20 18:59:18 steve Exp $ # # The first column is the unit name. The second column indicates whether or # not the unit name has a plural form (i.e. with an 's' appended). # A 'P' indicates that the unit has a plural form, whereas, a 'S' indicates # that the unit has a singular form only. The remainder of the line is the # definition for the unit. # # '#' is the to-end-of-line comment-character. # # NB: When adding to this table, be *very* careful to distinquish between # the letter 'O' and the numeral zero '0'. For example, the following two # entries don't do what one might otherwise expect: # # mercury_0C mercury_32F # millimeter_Hg_0C mm mercury_OC # # BASE UNITS. These must be first and are identified by a nil definition. # ampere P # electric current count P # dimensionless decimal number candela P # luminous intensity kelvin P # thermodynamic temperature kilogram P # mass meter P # length mole P # amount of substance second P # time radian P # plane angle # # CONSTANTS # percent S 0.01 PI S 3.14159265358979323846 bakersdozen S 13 pair P 2 ten P 10 dozen S 12 score S 20 hundred P 100 thousand P 1.0e3 million P 1.0e6 % S percent pi S PI # # NB: All subsequent definitions must be given in terms of # earlier definitions. Forward referencing is not permitted. # # # The following are non-base units of the fundamental quantities # bit P count # unit of information # # UNITS OF ELECTRIC CURRENT # A S ampere amp P ampere abampere P 10 ampere # exact gilbert P 7.957747e-1 ampere statampere P 3.335640e-10 ampere biot P 10 ampere # # UNITS OF LUMINOUS INTENSITY # cd S candela candle P candela # # UNITS OF THERMODYNAMIC TEMPERATURE # degree_Kelvin P kelvin degree_Celsius S kelvin @ 273.15 degree_Rankine P kelvin/1.8 degree_Fahrenheit P degree_Rankine @ 459.67 #C S degree_Celsius # `C' means `coulomb' Celsius S degree_Celsius celsius S degree_Celsius degree_centigrade S degree_Celsius # approx. was just `centigrade' degC S degree_Celsius degreeC S degree_Celsius degree_C S degree_Celsius degree_c S degree_Celsius deg_C S degree_Celsius deg_c S degree_Celsius degK S kelvin degreeK S kelvin degree_K S kelvin degree_k S kelvin deg_K S kelvin deg_k S kelvin K S kelvin Kelvin P kelvin degF S degree_Fahrenheit degreeF S degree_Fahrenheit degree_F S degree_Fahrenheit degree_f S degree_Fahrenheit deg_F S degree_Fahrenheit deg_f S degree_Fahrenheit F S degree_Fahrenheit Fahrenheit P degree_Fahrenheit fahrenheit P degree_Fahrenheit degR S degree_Rankine degreeR S degree_Rankine degree_R S degree_Rankine degree_r S degree_Rankine deg_R S degree_Rankine deg_r S degree_Rankine #R S degree_Rankine # `R' means `roentgen' Rankine P degree_Rankine rankine P degree_Rankine # # UNITS OF MASS # assay_ton P 2.916667e-2 kilogram # was 2.916667e2 (typo!) avoirdupois_ounce P 2.834952e-2 kilogram avoirdupois_pound P 4.5359237e-1 kilogram # exact carat P 2e-4 kilogram grain P 6.479891e-5 kilogram # exact gram P 1e-3 kilogram # exact g S gram kg S kilogram long_hundredweight P 5.080235e1 kilogram metric_ton P 1e3 kilogram # exact pennyweight P 1.555174e-3 kilogram short_hundredweight P 4.535924e1 kilogram slug P 14.59390 kilogram troy_ounce P 3.110348e-2 kilogram troy_pound P 3.732417e-1 kilogram atomic_mass_unit P 1.66054e-27 kilogram # was 1.66044e-27 tonne P metric_ton apothecary_ounce P troy_ounce apothecary_pound P troy_pound pound P avoirdupois_pound metricton P metric_ton gr S grain scruple P 20 grain apdram P 60 grain apounce P 480 grain appound P 5760 grain atomicmassunit P atomic_mass_unit amu P atomic_mass_unit t S tonne lb P pound bag P 94 pound short_ton P 2000 pound long_ton P 2240 pound ton P short_ton shortton P short_ton longton P long_ton # # UNITS OF LENGTH # angstrom P decinanometer astronomical_unit P 1.495979e11 meter fermi P 1e-15 meter # exact m S meter metre P meter light_year P 9.46073e15 meter # was ASTM's 9.46055e15 meter micron P 1e-6 meter # exact mil P 2.54e-5 meter # exact nautical_mile P 1.852000e3 meter # exact parsec P 3.085678e16 meter printers_point P 3.514598e-4 meter # God help us! There's an international foot and a US survey foot and # they're not the same! # US Survey foot stuff: US_survey_foot S (1200/3937) meter # exact US_survey_feet S US_survey_foot # alias US_survey_yard P 3 US_survey_feet # exact US_survey_mile P 5280 US_survey_feet # exact US_statute_mile P US_survey_mile # alias rod P 16.5 US_survey_feet # exact pole P rod # alias perch S rod # alias perches S perch # alias furlong P 660 US_survey_feet # exact fathom P 6 US_survey_feet # exact # International foot stuff: international_inch S 2.54 cm # exact international_inches S international_inch # alias international_foot S 12 international_inches # exact international_feet S international_foot # alias international_yard P 3 international_feet # exact international_mile P 5280 international_feet # exact # Alias unspecified units to the international units: inch S international_inch # alias foot S international_foot # alias yard P international_yard # alias mile P international_mile # alias # The following should hold regardless: inches S inch # alias in S inches # alias feet S foot # alias ft S feet # alias yd S yard # alias mi S mile # alias chain P 2.011684e1 meter printers_pica P 12 printers_point # exact astronomicalunit P astronomical_unit au S astronomical_unit nmile P nautical_mile nmi S nautical_mile pica P printers_pica big_point P inch/72 # exact barleycorn P inch/3 arpentlin P 191.835 foot # # UNITS OF AMOUNT OF SUBSTANCE # mol S mole # # UNITS OF TIME # day P 8.64e4 second # exact hour P 3.6e3 second # exact minute P 60 second # exact s S second sec P second shake P 1e-8 second # exact sidereal_day P 8.616409e4 second sidereal_hour P 3.590170e3 second sidereal_minute P 5.983617e1 second sidereal_second P 0.9972696 second sidereal_year P 3.155815e7 second # Interval between 2 successive passages of sun through vernal equinox # (365.242198781 days -- see # http://www.ast.cam.ac.uk/pubinfo/leaflets/, # http://aa.usno.navy.mil/AA/ # and http://adswww.colorado.edu/adswww/astro_coord.html): tropical_year P 3.15569259747e7 second lunar_month P 29.530589 day common_year P 365 day # exact: 3.153600e7 seconds leap_year P 366 day # exact Julian_year P 365.25 day # exact Gregorian_year P 365.2425 day # exact sidereal_month P 27.321661 day tropical_month P 27.321582 day d S day min P minute hr P hour h S hour fortnight P 14 day # exact week P 7 day # exact jiffy S 0.01 second # believe it or not! jiffies S jiffy # assumed plural spelling year P tropical_year yr P year a S year # "anno" eon P 1e9 year # fuzzy month P year/12 # on average # # UNITS OF PLANE ANGLE # #rad P radian # `rad' means `1e-2 gray' circle P 2 pi radian angular_degree P (pi/180) radian turn P circle degree P angular_degree degree_north S angular_degree degree_east S angular_degree degree_true S angular_degree arcdeg P angular_degree angular_minute P angular_degree/60 angular_second P angular_minute/60 grade P 0.9 angular_degree # exact degrees_north S degree_north degreeN S degree_north degree_N S degree_north degreesN S degree_north degrees_N S degree_north degrees_east S degree_east degreeE S degree_east degree_E S degree_east degreesE S degree_east degrees_E S degree_east degree_west S -1 degree_east degrees_west S degree_west degreeW S degree_west degree_W S degree_west degreesW S degree_west degrees_W S degree_west degrees_true S degree_true degreeT S degree_true degree_T S degree_true degreesT S degree_true degrees_T S degree_true arcminute P angular_minute arcsecond P angular_second arcmin P arcminute arcsec P arcsecond # # The following are derived units with special names. They are useful for # defining other derived units. # steradian P radian2 hertz S 1/second newton P kilogram.meter/second2 coulomb P ampere.second lumen P candela steradian becquerel P 1/second # SI unit of activity of a # # radionuclide standard_free_fall S 9.806650 meter/second2 # exact pascal P newton/meter2 joule P newton.meter Hz S hertz sr S steradian force S standard_free_fall gravity S standard_free_fall free_fall S standard_free_fall lux S lumen/meter2 sphere P 4 pi steradian luxes S lux watt P joule/second gray P joule/kilogram # absorbed dose. derived unit sievert P joule/kilogram # dose equivalent. derived unit conventional_mercury S gravity 13595.10 kg/m3 mercury_0C S gravity 13595.1 kg/m3 # was 13595.065 mercury_60F S gravity 13556.8 kg/m3 # was 13556.806 conventional_water S gravity 1000 kg/m3 # exact water_4C S gravity 999.972 kg/m3 # was 999.97226 water_60F S gravity 999.001 kg/m3 # was 999.00072 volt P watt/ampere mercury_32F S mercury_0C water_39F S water_4C # actually 39.2 F mercury S conventional_mercury # was mercury_32F water S conventional_water # was water_4C farad P coulomb/volt ohm P volt/ampere siemens S ampere/volt weber P volt.second Hg S mercury hg S mercury H2O S water h2o S water tesla P weber/meter2 henry P weber/ampere # # The following are compound units: units whose definitions consist # of two or more base units. They may now be defined in terms of the # preceding units. # # # ACCELERATION # gal P 1e-2 meter/second2 # exact # # Area # are P 1e2 m2 # exact barn P 1e-28 m2 # exact circular_mil P 5.067075e-10 m2 darcy P 9.869233e-13 m2 # permeability of porous solids hectare P 1e4 m2 # exact acre P 160 rod2 # exact b S barn # # ELECTRICITY AND MAGNETISM # abfarad P 1e9 farad # exact abhenry P 1e-9 henry # exact abmho P 1e9 siemens # exact abohm P 1e-9 ohm # exact abvolt P 1e-8 volt # exact C S coulomb e S 1.60217733-19 coulomb # was 1.6021917e-19 chemical_faraday P 9.64957e4 coulomb physical_faraday P 9.65219e4 coulomb C12_faraday P 9.648531e4 coulomb gamma P 1e-9 tesla # exact gauss S 1e-4 tesla # exact H S henry maxwell P 1e-8 weber # exact oersted P 7.957747e1 ampere/meter S S siemens statcoulomb P 3.335640e-10 coulomb statfarad P 1.112650e-12 farad stathenry P 8.987554e11 henry statmho P 1.112650e-12 siemens statohm P 8.987554e11 ohm statvolt P 2.997925e2 volt T S tesla unit_pole P 1.256637e-7 weber V S volt Wb S weber mho P siemens Oe S oersted faraday P C12_faraday # charge of 1 mole of # # electrons # # ENERGY (INCLUDES WORK) # electronvolt P 1.602177e-19 joule erg P 1e-7 joule # exact IT_Btu P 1.05505585262e3 joule # exact, was 1.055056e3 EC_therm P 1.05506e8 joule # exact thermochemical_calorie P 4.184000 joule # exact IT_calorie P 4.1868 joule # exact J S joule ton_TNT S 4.184e9 joule US_therm P 1.054804e8 joule # exact watthour P watt hour therm P US_therm Wh S watthour Btu P IT_Btu calorie P IT_calorie electron_volt P electronvolt thm S therm cal S calorie eV S electronvolt bev S gigaelectron_volt # # FORCE # dyne P 1e-5 newton # exact pond P 9.806650e-3 newton # exact, was 1.806650e-3 (typo) force_kilogram S 9.806650 newton # exact force_ounce S 2.780139e-1 newton force_pound S 4.4482216152605 newton# exact poundal P 1.382550e-1 newton N S newton gf S gram force force_gram P 1e-3 force_kilogram force_ton P 2000 force_pound # exact lbf S force_pound ounce_force S force_ounce kilogram_force S force_kilogram pound_force S force_pound ozf S force_ounce kgf S force_kilogram kip P 1000 lbf ton_force S force_ton gram_force S force_gram # # HEAT # clo P 1.55e-1 kelvin.meter2/watt # # LIGHT # lm S lumen lx S lux footcandle P 1.076391e-1 lux footlambert P 3.426259 candela/meter2 lambert P (1e4/PI) candela/meter2 # exact stilb P 1e4 candela/meter2 # exact phot P 1e4 lumen/meter2 # exact nit P 1 candela/meter2 # exact langley P 4.184000e4 joule/meter2 # exact blondel P candela/(pi meter2) apostilb P blondel nt S nit ph S phot sb S stilb # # MASS PER UNIT LENGTH # denier P 1.111111e-7 kilogram/meter tex P 1e-6 kilogram/meter # exact # # MASS PER UNIT TIME (INCLUDES FLOW) # perm_0C S 5.72135e-11 kg/(pascal second meter2) perm_23C S 5.74525e-11 kg/(pascal second meter2) # # POWER # voltampere P volt ampere VA S volt ampere boiler_horsepower P 9.80950e3 watt shaft_horsepower P 7.456999e2 watt metric_horsepower P 7.35499e2 watt electric_horsepower P 7.460000e2 watt # exact W S watt water_horsepower P 7.46043e2 watt UK_horsepower P 7.4570e2 watt refrigeration_ton P 12000 Btu/hour horsepower P shaft_horsepower ton_of_refrigeration P refrigeration_ton hp S horsepower # # PRESSURE OR STRESS # bar P 1e5 pascal # exact standard_atmosphere P 1.01325e5 pascal # exact technical_atmosphere P 1 kg gravity/cm2 # exact inch_H2O_39F S inch water_39F inch_H2O_60F S inch water_60F inch_Hg_32F S inch mercury_32F inch_Hg_60F S inch mercury_60F millimeter_Hg_0C S mm mercury_0C footH2O S foot water cmHg S cm Hg cmH2O S cm water Pa S pascal inch_Hg S inch Hg inch_hg S inch Hg inHg S inch Hg in_Hg S inch Hg in_hg S inch Hg millimeter_Hg S mm Hg mmHg S mm Hg mm_Hg S mm Hg mm_hg S mm Hg torr P mm Hg foot_H2O S foot water ftH2O S foot water psi S 1 pound gravity/in2 ksi S kip/in2 barie P 0.1 newton/meter2 at S technical_atmosphere atmosphere P standard_atmosphere atm P standard_atmosphere barye P barie # # RADIATION UNITS # Bq S becquerel curie P 3.7e10 becquerel # exact rem P 1e-2 sievert # dose equivalent. exact rad P 1e-2 gray # absorbed dose. exact roentgen P 2.58e-4 coulomb/kg # exact Sv S sievert Gy S gray Ci S curie R S roentgen rd S rad # # VELOCITY (INCLUDES SPEED) # c S 2.997925e+8 meter/sec knot P nautical_mile/hour knot_international S knot international_knot S knot kt P knot # # VISCOSITY # poise S 1e-1 pascal second # absolute viscosity. # # exact stokes S 1e-4 meter2/second # exact rhe S 10/(pascal second) # exact St S stokes # # VOLUME (INCLUDES CAPACITY) # acre_foot S 1.233489e3 m3 # but `acre foot' is 1233.4867714897 meters^3. Odd. board_foot S 2.359737e-3 m3 bushel P 3.523907e-2 m3 UK_liquid_gallon P 4.546090e-3 m3 # exact. was 4.546092e-3 Canadian_liquid_gallon P 4.546090e-3 m3 # exact US_dry_gallon P 4.404884e-3 m3 US_liquid_gallon P 3.785412e-3 m3 cc S cm3 liter P 1e-3 m3 # exact. However, from 1901 to # # 1964, 1 liter = 1.000028 dm3 stere P 1 m3 # exact register_ton P 2.831685 m3 # was 3.831685 (typo!) US_dry_quart P US_dry_gallon/4 US_dry_pint P US_dry_gallon/8 US_liquid_quart P US_liquid_gallon/4 US_liquid_pint P US_liquid_gallon/8 US_liquid_cup P US_liquid_gallon/16 US_liquid_gill P US_liquid_gallon/32 US_fluid_ounce P US_liquid_gallon/128 US_liquid_ounce P US_fluid_ounce UK_liquid_quart P UK_liquid_gallon/4 UK_liquid_pint P UK_liquid_gallon/8 UK_liquid_cup P UK_liquid_gallon/16 UK_liquid_gill P UK_liquid_gallon/32 UK_fluid_ounce P UK_liquid_gallon/160 UK_liquid_ounce P UK_fluid_ounce liquid_gallon P US_liquid_gallon fluid_ounce P US_fluid_ounce #liquid_gallon P UK_liquid_gallon #fluid_ounce P UK_fluid_ounce dry_quart P US_dry_quart dry_pint P US_dry_pint liquid_quart P liquid_gallon/4 liquid_pint P liquid_gallon/8 gallon P liquid_gallon barrel P 42 US_liquid_gallon # petroleum industry definition quart P liquid_quart pint P liquid_pint cup P liquid_gallon/16 gill P liquid_gallon/32 tablespoon P US_fluid_ounce/2 teaspoon P tablespoon/3 peck P bushel/4 oz P fluid_ounce floz S fluid_ounce acre_feet S acre_foot board_feet S board_foot Tbl P tablespoon Tbsp S tablespoon tbsp S tablespoon Tblsp S tablespoon tblsp S tablespoon litre P liter L S liter l S liter tsp S teaspoon pk S peck bu S bushel fldr S floz/8 dram P floz/16 bbl S barrel firkin P barrel/4 # exact but barrel is vague pt S pint dr S dram # # COMPUTERS AND COMMUNICATION # baud S 1/second # exact bps S bit/second cps S hertz Bd S baud # # MISC # kayser P 1e2/meter # exact rps S hertz rpm S hertz/60 geopotential S gravity work_year P 2056 hours work_month P work_year/12 gp S geopotential dynamic S geopotential