SystemOfUnits.h

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#ifndef ELEMENTSKERNEL_ELEMENTSKERNEL_SYSTEMOFUNITS_H_
#define ELEMENTSKERNEL_ELEMENTSKERNEL_SYSTEMOFUNITS_H_
 
#include "ElementsKernel/MathConstants.h"
 
namespace Elements {
inline namespace Kernel {
namespace Units {
 
//
// Length [L]
//
constexpr double meter  = 1.0;
constexpr double meter2 = meter * meter;
constexpr double meter3 = meter * meter * meter;
 
constexpr double millimeter  = 1.e-3 * meter;
constexpr double millimeter2 = millimeter * millimeter;
constexpr double millimeter3 = millimeter * millimeter * millimeter;
 
constexpr double centimeter  = 1.e-2 * meter;
constexpr double centimeter2 = centimeter * centimeter;
constexpr double centimeter3 = centimeter * centimeter * centimeter;
 
constexpr double kilometer  = 1000. * meter;
constexpr double kilometer2 = kilometer * kilometer;
constexpr double kilometer3 = kilometer * kilometer * kilometer;
 
constexpr double parsec = 3.0856775807e+16 * meter;
 
constexpr double micrometer = 1.e-6 * meter;
constexpr double nanometer  = 1.e-9 * meter;
constexpr double angstrom   = 1.e-10 * meter;
constexpr double fermi      = 1.e-15 * meter;
 
constexpr double barn      = 1.e-28 * meter2;
constexpr double millibarn = 1.e-3 * barn;
constexpr double microbarn = 1.e-6 * barn;
constexpr double nanobarn  = 1.e-9 * barn;
constexpr double picobarn  = 1.e-12 * barn;
 
// symbols
constexpr double nm = nanometer;
constexpr double um = micrometer;
 
constexpr double mm  = millimeter;
constexpr double mm2 = millimeter2;
constexpr double mm3 = millimeter3;
 
constexpr double cm  = centimeter;
constexpr double cm2 = centimeter2;
constexpr double cm3 = centimeter3;
 
constexpr double m  = meter;
constexpr double m2 = meter2;
constexpr double m3 = meter3;
 
constexpr double km  = kilometer;
constexpr double km2 = kilometer2;
constexpr double km3 = kilometer3;
 
constexpr double pc = parsec;
 
//
// Angle
//
constexpr double radian      = 1.;
constexpr double milliradian = 1.e-3 * radian;
constexpr double degree      = (pi / 180.0) * radian;
 
constexpr double steradian = 1.;
 
// symbols
constexpr double rad  = radian;
constexpr double mrad = milliradian;
constexpr double sr   = steradian;
constexpr double deg  = degree;
 
//
// Time [T]
//
constexpr double second = 1.;
 
constexpr double nanosecond  = 1.e-9 * second;
constexpr double millisecond = 1.e-3 * second;
constexpr double microsecond = 1.e-6 * second;
constexpr double picosecond  = 1.e-12 * second;
constexpr double femtosecond = 1.e-15 * second;
 
constexpr double hertz     = 1. / second;
constexpr double kilohertz = 1.e+3 * hertz;
constexpr double megahertz = 1.e+6 * hertz;
 
// symbols
constexpr double ns = nanosecond;
constexpr double s  = second;
constexpr double ms = millisecond;
 
//
// Electric current [I]
//
constexpr double ampere      = 1.0;
constexpr double milliampere = 1.e-3 * ampere;
constexpr double microampere = 1.e-6 * ampere;
constexpr double nanoampere  = 1.e-9 * ampere;
 
//
// Electric charge [I][T]
//
constexpr double coulomb = ampere * second;
constexpr double eplus   = 1.;                         // positron charge
constexpr double e_SI    = 1.602176565e-19 * coulomb;  // positron charge in coulomb
 
//
// Mass [M]
//
constexpr double kilogram  = 1.0;
constexpr double gram      = 1.e-3 * kilogram;
constexpr double milligram = 1.e-3 * gram;
 
// symbols
constexpr double kg = kilogram;
constexpr double g  = gram;
constexpr double mg = milligram;
 
//
// Energy [M][L^2][T^-2]
//
constexpr double joule            = kilogram * (meter * meter) / (second * second);
constexpr double electronvolt     = joule * e_SI;
constexpr double megaelectronvolt = 1.e+6 * electronvolt;
constexpr double kiloelectronvolt = 1.e+3 * electronvolt;
constexpr double gigaelectronvolt = 1.e+9 * electronvolt;
constexpr double teraelectronvolt = 1.e+12 * electronvolt;
constexpr double petaelectronvolt = 1.e+15 * electronvolt;
constexpr double erg              = 1.e-7 * joule;
 
// symbols
constexpr double MeV = megaelectronvolt;
constexpr double eV  = electronvolt;
constexpr double keV = kiloelectronvolt;
constexpr double GeV = gigaelectronvolt;
constexpr double TeV = teraelectronvolt;
constexpr double PeV = petaelectronvolt;
 
//
// Power [E][T^-1]
//
constexpr double watt = joule / second;
 
//
// Force [E][L^-1]
//
constexpr double newton = joule / meter;
 
//
// Pressure [E][L^-3]
//
constexpr double Pa         = newton / m2;
constexpr double bar        = 100000 * Pa;
constexpr double atmosphere = 101325 * Pa;
 
//
// Electric potential [E][Q^-1]
//
constexpr double volt     = electronvolt / eplus;
constexpr double megavolt = 1.e+6 * volt;
constexpr double kilovolt = 1.e+3 * volt;
 
//
// Electric resistance [E][T][Q^-2]
//
constexpr double ohm = volt / ampere;
 
//
// Electric capacitance [Q^2][E^-1]
//
constexpr double farad      = coulomb / volt;
constexpr double millifarad = 1.e-3 * farad;
constexpr double microfarad = 1.e-6 * farad;
constexpr double nanofarad  = 1.e-9 * farad;
constexpr double picofarad  = 1.e-12 * farad;
 
//
// Magnetic Flux [T][E][Q^-1]
//
constexpr double weber = volt * second;
//
// Magnetic Field [T][E][Q^-1][L^-2]
//
constexpr double tesla = volt * second / meter2;
 
constexpr double gauss     = 1.e-4 * tesla;
constexpr double kilogauss = 1.e-1 * tesla;
 
//
// Inductance [T^2][E][Q^-2]
//
constexpr double henry = weber / ampere;
 
//
// Temperature
//
constexpr double kelvin = 1.;
 
//
// Amount of substance
//
constexpr double mole = 1.;
 
//
// Activity [T^-1]
//
constexpr double becquerel = 1. / second;
constexpr double curie     = 3.7e+10 * becquerel;
 
//
// Absorbed dose [L^2][T^-2]
//
constexpr double gray = joule / kilogram;
 
//
// Luminous intensity [I]
//
constexpr double candela = 1.;
 
//
// Luminous flux [I]
//
constexpr double lumen       = candela * steradian;
constexpr double jansky      = 1.e-26 * watt / (m2 * hertz);
constexpr double microjansky = 1.e-6 * jansky;
 
//
// Illuminance [I][L^-2]
//
constexpr double lux = lumen / meter2;
 
//
// Miscellaneous
//
constexpr double perCent     = 0.01;
constexpr double perThousand = 0.001;
constexpr double perMillion  = 0.000001;
 
}  // namespace Units
}  // namespace Kernel
}  // namespace Elements
 
#endif  // ELEMENTSKERNEL_ELEMENTSKERNEL_SYSTEMOFUNITS_H_