This is a copy of udunits.txt, downloaded from http://www.unidata.ucar.edu/software/udunits/udunits-1/udunits.txt

# $Id: udunits.dat,v 1.15 2003/08/29 18:31:12 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
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 `grey'
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
g S gravity # approx. should be `local'

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 7.35499 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