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dab42d20185975fb0910dadfc6aa9998d9d9e06d
geant4/source/global/management/include/G4SIunits.hh
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Gabriele Cosmo dab42d2018 Import Geant4 10.7.0 source tree
2020-12-04 12:30:43 +01:00

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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// G4SIunits
//
// Description:
//
// This file is a modified version of CLHEP SystemOfUnits.h
// It is provided for checking the overall 'units coherence' in Geant4.
// The basic units are those of the International System:
//
// meter
// second
// kilogram
// ampere
// degree kelvin
// the amount of substance (mole)
// luminous intensity (candela)
// radian
// steradian
//
// 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 CLHEP header file
// for PhysicalConstants.
// Authors: M.Maire, S.Giani - 10.03.1999
// --------------------------------------------------------------------
#ifndef SI_SYSTEM_OF_UNITS_HH
#define SI_SYSTEM_OF_UNITS_HH 1
static constexpr double pi = 3.14159265358979323846;
static constexpr double twopi = 2 * pi;
static constexpr double halfpi = pi / 2;
static constexpr double pi2 = pi * pi;
//
// Length [L]
//
static constexpr double meter = 1.;
static constexpr double meter2 = meter * meter;
static constexpr double meter3 = meter * meter * meter;
static constexpr double millimeter = 0.001 * meter;
static constexpr double millimeter2 = millimeter * millimeter;
static constexpr double millimeter3 = millimeter * millimeter * millimeter;
static constexpr double centimeter = 10. * millimeter;
static constexpr double centimeter2 = centimeter * centimeter;
static constexpr double centimeter3 = centimeter * centimeter * centimeter;
static constexpr double kilometer = 1000. * meter;
static constexpr double kilometer2 = kilometer * kilometer;
static constexpr double kilometer3 = kilometer * kilometer * kilometer;
static constexpr double parsec = 3.0856775807e+16 * meter;
static constexpr double micrometer = 1.e-6 * meter;
static constexpr double nanometer = 1.e-9 * meter;
static constexpr double angstrom = 1.e-10 * meter;
static constexpr double fermi = 1.e-15 * meter;
static constexpr double barn = 1.e-28 * meter2;
static constexpr double millibarn = 1.e-3 * barn;
static constexpr double microbarn = 1.e-6 * barn;
static constexpr double nanobarn = 1.e-9 * barn;
static constexpr double picobarn = 1.e-12 * barn;
// symbols
static constexpr double nm = nanometer;
static constexpr double um = micrometer;
static constexpr double mm = millimeter;
static constexpr double mm2 = millimeter2;
static constexpr double mm3 = millimeter3;
static constexpr double cm = centimeter;
static constexpr double cm2 = centimeter2;
static constexpr double cm3 = centimeter3;
static constexpr double liter = 1.e+3 * cm3;
static constexpr double L = liter;
static constexpr double dL = 1.e-1 * liter;
static constexpr double cL = 1.e-2 * liter;
static constexpr double mL = 1.e-3 * liter;
static constexpr double m = meter;
static constexpr double m2 = meter2;
static constexpr double m3 = meter3;
static constexpr double km = kilometer;
static constexpr double km2 = kilometer2;
static constexpr double km3 = kilometer3;
static constexpr double pc = parsec;
//
// Angle
//
static constexpr double radian = 1.;
static constexpr double milliradian = 1.e-3 * radian;
static constexpr double degree = (pi / 180.0) * radian;
static constexpr double steradian = 1.;
// symbols
static constexpr double rad = radian;
static constexpr double mrad = milliradian;
static constexpr double sr = steradian;
static constexpr double deg = degree;
//
// Time [T]
//
static constexpr double second = 1.;
static constexpr double nanosecond = 1.e-9 * second;
static constexpr double millisecond = 1.e-3 * second;
static constexpr double microsecond = 1.e-6 * second;
static constexpr double picosecond = 1.e-12 * second;
static constexpr double hertz = 1. / second;
static constexpr double kilohertz = 1.e+3 * hertz;
static constexpr double megahertz = 1.e+6 * hertz;
// symbols
static constexpr double ns = nanosecond;
static constexpr double s = second;
static constexpr double ms = millisecond;
static constexpr double us = microsecond;
static constexpr double ps = picosecond;
//
// Mass [E][T^2][L^-2]
//
static constexpr double kilogram = 1.;
static constexpr double gram = 1.e-3 * kilogram;
static constexpr double milligram = 1.e-3 * gram;
// symbols
static constexpr double kg = kilogram;
static constexpr double g = gram;
static constexpr double mg = milligram;
//
// Electric current [Q][T^-1]
//
static constexpr double ampere = 1.;
static constexpr double milliampere = 1.e-3 * ampere;
static constexpr double microampere = 1.e-6 * ampere;
static constexpr double nanoampere = 1.e-9 * ampere;
//
// Electric charge [Q]
//
static constexpr double coulomb = ampere * second;
static constexpr double e_SI = 1.602176634e-19; // positron charge in coulomb
static constexpr double eplus = e_SI * coulomb; // positron charge
//
// Energy [E]
//
static constexpr double joule = kg * m * m / (s * s);
static constexpr double electronvolt = e_SI * joule;
static constexpr double kiloelectronvolt = 1.e+3 * electronvolt;
static constexpr double megaelectronvolt = 1.e+6 * electronvolt;
static constexpr double gigaelectronvolt = 1.e+9 * electronvolt;
static constexpr double teraelectronvolt = 1.e+12 * electronvolt;
static constexpr double petaelectronvolt = 1.e+15 * electronvolt;
// symbols
static constexpr double MeV = megaelectronvolt;
static constexpr double eV = electronvolt;
static constexpr double keV = kiloelectronvolt;
static constexpr double GeV = gigaelectronvolt;
static constexpr double TeV = teraelectronvolt;
static constexpr double PeV = petaelectronvolt;
//
// Power [E][T^-1]
//
static constexpr double watt = joule / second; // watt = 6.24150 e+3 * MeV/ns
//
// Force [E][L^-1]
//
static constexpr 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 constexpr double hep_pascal =
newton / m2; // pascal = 6.24150 e+3 * MeV/mm3
static constexpr double bar = 100000 * pascal; // bar = 6.24150 e+8 * MeV/mm3
static constexpr double atmosphere =
101325 * pascal; // atm = 6.32420 e+8 * MeV/mm3
//
// Electric potential [E][Q^-1]
//
static constexpr double megavolt = megaelectronvolt / eplus;
static constexpr double kilovolt = 1.e-3 * megavolt;
static constexpr double volt = 1.e-6 * megavolt;
//
// Electric resistance [E][T][Q^-2]
//
static constexpr double ohm =
volt / ampere; // ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
//
// Electric capacitance [Q^2][E^-1]
//
static constexpr double farad =
coulomb / volt; // farad = 6.24150e+24 * eplus/Megavolt
static constexpr double millifarad = 1.e-3 * farad;
static constexpr double microfarad = 1.e-6 * farad;
static constexpr double nanofarad = 1.e-9 * farad;
static constexpr double picofarad = 1.e-12 * farad;
//
// Magnetic Flux [T][E][Q^-1]
//
static constexpr double weber = volt * second; // weber = 1000*megavolt*ns
//
// Magnetic Field [T][E][Q^-1][L^-2]
//
static constexpr double tesla =
volt * second / meter2; // tesla =0.001*megavolt*ns/mm2
static constexpr double gauss = 1.e-4 * tesla;
static constexpr double kilogauss = 1.e-1 * tesla;
//
// Inductance [T^2][E][Q^-2]
//
static constexpr double henry =
weber / ampere; // henry = 1.60217e-7*MeV*(ns/eplus)**2
//
// Temperature
//
static constexpr double kelvin = 1.;
//
// Amount of substance
//
static constexpr double mole = 1.;
//
// Activity [T^-1]
//
static constexpr double becquerel = 1. / second;
static constexpr double curie = 3.7e+10 * becquerel;
static constexpr double kilobecquerel = 1.e+3 * becquerel;
static constexpr double megabecquerel = 1.e+6 * becquerel;
static constexpr double gigabecquerel = 1.e+9 * becquerel;
static constexpr double millicurie = 1.e-3 * curie;
static constexpr double microcurie = 1.e-6 * curie;
static constexpr double Bq = becquerel;
static constexpr double kBq = kilobecquerel;
static constexpr double MBq = megabecquerel;
static constexpr double GBq = gigabecquerel;
static constexpr double Ci = curie;
static constexpr double mCi = millicurie;
static constexpr double uCi = microcurie;
//
// Absorbed dose [L^2][T^-2]
//
static constexpr double gray = joule / kilogram;
static constexpr double kilogray = 1.e+3 * gray;
static constexpr double milligray = 1.e-3 * gray;
static constexpr double microgray = 1.e-6 * gray;
//
// Luminous intensity [I]
//
static constexpr double candela = 1.;
//
// Luminous flux [I]
//
static constexpr double lumen = candela * steradian;
//
// Illuminance [I][L^-2]
//
static constexpr double lux = lumen / meter2;
//
// Miscellaneous
//
static constexpr double perCent = 0.01;
static constexpr double perThousand = 0.001;
static constexpr double perMillion = 0.000001;
#endif
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