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geant4/source/externals/clhep/include/CLHEP/Units/SystemOfUnits.h
T
Gabriele Cosmo b1eb5424d2 Import Geant4 9.5.0 source tree
2016-06-09 16:46:55 +02:00

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// -*- C++ -*-
// $Id:$
// ----------------------------------------------------------------------
// 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
// 31.01.06 kilogray, milligray, microgray
// 29.04.08 use PDG 2006 value of e_SI
// 03.11.08 use PDG 2008 value of e_SI
#ifndef HEP_SYSTEM_OF_UNITS_H
#define HEP_SYSTEM_OF_UNITS_H
namespace CLHEP {
//
// Length [L]
//
static const double millimeter = 1.;
static const double millimeter2 = millimeter*millimeter;
static const double millimeter3 = millimeter*millimeter*millimeter;
static const double centimeter = 10.*millimeter;
static const double centimeter2 = centimeter*centimeter;
static const double centimeter3 = centimeter*centimeter*centimeter;
static const double meter = 1000.*millimeter;
static const double meter2 = meter*meter;
static const double meter3 = meter*meter*meter;
static const double kilometer = 1000.*meter;
static const double kilometer2 = kilometer*kilometer;
static const double kilometer3 = kilometer*kilometer*kilometer;
static const double parsec = 3.0856775807e+16*meter;
static const double micrometer = 1.e-6 *meter;
static const double nanometer = 1.e-9 *meter;
static const double angstrom = 1.e-10*meter;
static const double fermi = 1.e-15*meter;
static const double barn = 1.e-28*meter2;
static const double millibarn = 1.e-3 *barn;
static const double microbarn = 1.e-6 *barn;
static const double nanobarn = 1.e-9 *barn;
static const double picobarn = 1.e-12*barn;
// symbols
static const double nm = nanometer;
static const double um = micrometer;
static const double mm = millimeter;
static const double mm2 = millimeter2;
static const double mm3 = millimeter3;
static const double cm = centimeter;
static const double cm2 = centimeter2;
static const double cm3 = centimeter3;
static const double m = meter;
static const double m2 = meter2;
static const double m3 = meter3;
static const double km = kilometer;
static const double km2 = kilometer2;
static const double km3 = kilometer3;
static const double pc = parsec;
//
// Angle
//
static const double radian = 1.;
static const double milliradian = 1.e-3*radian;
static const double degree = (3.14159265358979323846/180.0)*radian;
static const double steradian = 1.;
// symbols
static const double rad = radian;
static const double mrad = milliradian;
static const double sr = steradian;
static const double deg = degree;
//
// Time [T]
//
static const double nanosecond = 1.;
static const double second = 1.e+9 *nanosecond;
static const double millisecond = 1.e-3 *second;
static const double microsecond = 1.e-6 *second;
static const double picosecond = 1.e-12*second;
static const double hertz = 1./second;
static const double kilohertz = 1.e+3*hertz;
static const double megahertz = 1.e+6*hertz;
// symbols
static const double ns = nanosecond;
static const double s = second;
static const double ms = millisecond;
//
// Electric charge [Q]
//
static const double eplus = 1. ;// positron charge
static const double e_SI = 1.602176487e-19;// positron charge in coulomb
static const double coulomb = eplus/e_SI;// coulomb = 6.24150 e+18 * eplus
//
// Energy [E]
//
static const double megaelectronvolt = 1. ;
static const double electronvolt = 1.e-6*megaelectronvolt;
static const double kiloelectronvolt = 1.e-3*megaelectronvolt;
static const double gigaelectronvolt = 1.e+3*megaelectronvolt;
static const double teraelectronvolt = 1.e+6*megaelectronvolt;
static const double petaelectronvolt = 1.e+9*megaelectronvolt;
static const double joule = electronvolt/e_SI;// joule = 6.24150 e+12 * MeV
// symbols
static const double MeV = megaelectronvolt;
static const double eV = electronvolt;
static const double keV = kiloelectronvolt;
static const double GeV = gigaelectronvolt;
static const double TeV = teraelectronvolt;
static const double PeV = petaelectronvolt;
//
// Mass [E][T^2][L^-2]
//
static const double kilogram = joule*second*second/(meter*meter);
static const double gram = 1.e-3*kilogram;
static const double milligram = 1.e-3*gram;
// symbols
static const double kg = kilogram;
static const double g = gram;
static const double mg = milligram;
//
// Power [E][T^-1]
//
static const double watt = joule/second;// watt = 6.24150 e+3 * MeV/ns
//
// Force [E][L^-1]
//
static const double newton = joule/meter;// newton = 6.24150 e+9 * MeV/mm
//
// Pressure [E][L^-3]
//
#define pascal hep_pascal // a trick to avoid warnings
static const double hep_pascal = newton/m2; // pascal = 6.24150 e+3 * MeV/mm3
static const double bar = 100000*pascal; // bar = 6.24150 e+8 * MeV/mm3
static const double atmosphere = 101325*pascal; // atm = 6.32420 e+8 * MeV/mm3
//
// Electric current [Q][T^-1]
//
static const double ampere = coulomb/second; // ampere = 6.24150 e+9 * eplus/ns
static const double milliampere = 1.e-3*ampere;
static const double microampere = 1.e-6*ampere;
static const double nanoampere = 1.e-9*ampere;
//
// Electric potential [E][Q^-1]
//
static const double megavolt = megaelectronvolt/eplus;
static const double kilovolt = 1.e-3*megavolt;
static const double volt = 1.e-6*megavolt;
//
// Electric resistance [E][T][Q^-2]
//
static const double ohm = volt/ampere;// ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
//
// Electric capacitance [Q^2][E^-1]
//
static const double farad = coulomb/volt;// farad = 6.24150e+24 * eplus/Megavolt
static const double millifarad = 1.e-3*farad;
static const double microfarad = 1.e-6*farad;
static const double nanofarad = 1.e-9*farad;
static const double picofarad = 1.e-12*farad;
//
// Magnetic Flux [T][E][Q^-1]
//
static const double weber = volt*second;// weber = 1000*megavolt*ns
//
// Magnetic Field [T][E][Q^-1][L^-2]
//
static const double tesla = volt*second/meter2;// tesla =0.001*megavolt*ns/mm2
static const double gauss = 1.e-4*tesla;
static const double kilogauss = 1.e-1*tesla;
//
// Inductance [T^2][E][Q^-2]
//
static const double henry = weber/ampere;// henry = 1.60217e-7*MeV*(ns/eplus)**2
//
// Temperature
//
static const double kelvin = 1.;
//
// Amount of substance
//
static const double mole = 1.;
//
// Activity [T^-1]
//
static const double becquerel = 1./second ;
static const double curie = 3.7e+10 * becquerel;
//
// Absorbed dose [L^2][T^-2]
//
static const double gray = joule/kilogram ;
static const double kilogray = 1.e+3*gray;
static const double milligray = 1.e-3*gray;
static const double microgray = 1.e-6*gray;
//
// Luminous intensity [I]
//
static const double candela = 1.;
//
// Luminous flux [I]
//
static const double lumen = candela*steradian;
//
// Illuminance [I][L^-2]
//
static const double lux = lumen/meter2;
//
// Miscellaneous
//
static const double perCent = 0.01 ;
static const double perThousand = 0.001;
static const double perMillion = 0.000001;
} // namespace CLHEP
#endif /* HEP_SYSTEM_OF_UNITS_H */
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