# File: AthenaCommon/share/SystemOfUnits.py # Author: Wim Lavrijsen (LBNL, WLavrijsen@lbl.gov) # Created: 01/21/04 # Last: 01/21/04 # This script is a direct adaptation of CLHEP/Units/SystemOfUnits.h # and the following is the originial CLHEP comment: # # ----- # HEP coherent system of Units # # This file has been provided to CLHEP by Geant4 (simulation toolkit for HEP). # # The basic units are : # millimeter (millimeter) # nanosecond (nanosecond) # Mega electron Volt (MeV) # positron charge (eplus) # degree Kelvin (kelvin) # the amount of substance (mole) # luminous intensity (candela) # radian (radian) # steradian (steradian) # # Below is a non exhaustive list of derived and pratical units # (i.e. mostly the SI units). # You can add your own units. # # The SI numerical value of the positron charge is defined here, # as it is needed for conversion factor : positron charge = e_SI (coulomb) # # The others physical constants are defined in the header file : # PhysicalConstants.h # # Authors: M.Maire, S.Giani # # History: # # 06.02.96 Created. # 28.03.96 Added miscellaneous constants. # 05.12.97 E.Tcherniaev: Redefined pascal (to avoid warnings on WinNT) # 20.05.98 names: meter, second, gram, radian, degree # (from Brian.Lasiuk@yale.edu (STAR)). Added luminous units. # 05.08.98 angstrom, picobarn, microsecond, picosecond, petaelectronvolt # 01.03.01 parsec # ----- # # Length [L] # from __future__ import absolute_import, unicode_literals, division millimeter = 1. millimeter2 = millimeter * millimeter millimeter3 = millimeter * millimeter * millimeter centimeter = 10. * millimeter centimeter2 = centimeter * centimeter centimeter3 = centimeter * centimeter * centimeter meter = 1000. * millimeter meter2 = meter * meter meter3 = meter * meter * meter kilometer = 1000. * meter kilometer2 = kilometer * kilometer kilometer3 = kilometer * kilometer * kilometer parsec = 3.0856775807e+16 * meter micrometer = 1.e-6 * meter nanometer = 1.e-9 * meter angstrom = 1.e-10 * meter fermi = 1.e-15 * meter barn = 1.e-28 * meter2 millibarn = 1.e-3 * barn microbarn = 1.e-6 * barn nanobarn = 1.e-9 * barn picobarn = 1.e-12 * barn # symbols mm = millimeter mm2 = millimeter2 mm3 = millimeter3 cm = centimeter cm2 = centimeter2 cm3 = centimeter3 m = meter m2 = meter2 m3 = meter3 km = kilometer km2 = kilometer2 km3 = kilometer3 pc = parsec # # Angle # radian = 1. milliradian = 1.e-3 * radian degree = (3.14159265358979323846 / 180.0) * radian steradian = 1. # symbols rad = radian mrad = milliradian sr = steradian deg = degree # # Time [T] # nanosecond = 1. second = 1.e+9 * nanosecond millisecond = 1.e-3 * second microsecond = 1.e-6 * second picosecond = 1.e-12 * second femtosecond = 1.e-15 * second hertz = 1. / second kilohertz = 1.e+3 * hertz megahertz = 1.e+6 * hertz # symbols ns = nanosecond s = second ms = millisecond # # Electric charge [Q] # eplus = 1. # positron charge e_SI = 1.60217733e-19 # positron charge in coulomb coulomb = eplus / e_SI # coulomb = 6.24150 e+18 * eplus # # Energy [E] # megaelectronvolt = 1. electronvolt = 1.e-6 * megaelectronvolt kiloelectronvolt = 1.e-3 * megaelectronvolt gigaelectronvolt = 1.e+3 * megaelectronvolt teraelectronvolt = 1.e+6 * megaelectronvolt petaelectronvolt = 1.e+9 * megaelectronvolt joule = electronvolt / e_SI # joule = 6.24150 e+12 * MeV # symbols MeV = megaelectronvolt eV = electronvolt keV = kiloelectronvolt GeV = gigaelectronvolt TeV = teraelectronvolt PeV = petaelectronvolt # # Mass [E][T^2][L^-2] # kilogram = joule * second * second / (meter * meter) gram = 1.e-3 * kilogram milligram = 1.e-3 * gram # symbols kg = kilogram g = gram mg = milligram # # Power [E][T^-1] # watt = joule / second # watt = 6.24150 e+3 * MeV/ns # # Force [E][L^-1] # newton = joule / meter # newton = 6.24150 e+9 * MeV/mm # # Pressure [E][L^-3] # hep_pascal = newton / m2 # pascal = 6.24150 e+3 * MeV/mm3 pascal = hep_pascal # a trick to avoid warnings bar = 100000 * pascal # bar = 6.24150 e+8 * MeV/mm3 atmosphere = 101325 * pascal # atm = 6.32420 e+8 * MeV/mm3 # # Electric current [Q][T^-1] # ampere = coulomb / second # ampere = 6.24150 e+9 * eplus/ns milliampere = 1.e-3 * ampere microampere = 1.e-6 * ampere nanoampere = 1.e-9 * ampere # # Electric potential [E][Q^-1] # megavolt = megaelectronvolt / eplus kilovolt = 1.e-3 * megavolt volt = 1.e-6 * megavolt # # Electric resistance [E][T][Q^-2] # ohm = volt / ampere # ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns) # # Electric capacitance [Q^2][E^-1] # farad = coulomb / volt # farad = 6.24150e+24 * eplus/Megavolt millifarad = 1.e-3 * farad microfarad = 1.e-6 * farad nanofarad = 1.e-9 * farad picofarad = 1.e-12 * farad # # Magnetic Flux [T][E][Q^-1] # weber = volt * second # weber = 1000*megavolt*ns # # Magnetic Field [T][E][Q^-1][L^-2] # tesla = volt * second / meter2 # tesla =0.001*megavolt*ns/mm2 gauss = 1.e-4 * tesla kilogauss = 1.e-1 * tesla # # Inductance [T^2][E][Q^-2] # henry = weber / ampere # henry = 1.60217e-7*MeV*(ns/eplus)**2 # # Temperature # kelvin = 1. # # Amount of substance # mole = 1. # # Activity [T^-1] # becquerel = 1. / second curie = 3.7e+10 * becquerel # # Absorbed dose [L^2][T^-2] # gray = joule / kilogram # # Luminous intensity [I] # candela = 1. # # Luminous flux [I] # lumen = candela * steradian # # Illuminance [I][L^-2] # lux = lumen / meter2 # # Miscellaneous # perCent = 0.01 perThousand = 0.001 perMillion = 0.000001