PhysConstants.h

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#ifndef ELEMENTSKERNEL_ELEMENTSKERNEL_PHYSCONSTANTS_H_
#define ELEMENTSKERNEL_ELEMENTSKERNEL_PHYSCONSTANTS_H_
 
#include "ElementsKernel/SystemOfUnits.h"
 
namespace Elements {
inline namespace Kernel {
namespace Units {
 
constexpr double Avogadro = 6.0221367e+23 / mole;
 
constexpr double c_light = 2.99792458e+8 * m / s;
constexpr double c_squared = c_light * c_light;
 
constexpr double h_Planck = 6.62606957e-34 * joule * s;
constexpr double hbar_Planck = h_Planck / twopi;
constexpr double hbarc = hbar_Planck * c_light;
constexpr double hbarc_squared = hbarc * hbarc;
 
constexpr double electron_charge = -eplus;  // see SystemOfUnits.h
constexpr double e_squared = eplus * eplus;
 
constexpr double electron_mass = 9.10938291e-31 * kg;
constexpr double proton_mass = 1.672621777e-27 * kg;
constexpr double amu         = 1.660538921e-27 * kg;
 
constexpr double mu0 = 4 * pi * 1.e-7 * henry / m;
constexpr double epsilon0 = 1. / (c_squared * mu0);
 
constexpr double elm_coupling = e_squared / (4 * pi * epsilon0);
constexpr double fine_structure_const = elm_coupling / hbarc;
 
constexpr double k_Boltzmann = 1.3806488e-23 * joule / kelvin;
 
constexpr double STP_Temperature = 273.15 * kelvin;
constexpr double STP_Pressure    = 1. * atmosphere;
constexpr double kGasThreshold   = 10. * mg / cm3;
 
constexpr double universe_mean_density = 1.e-25 * g / cm3;
 
}  // namespace Units
}  // namespace Kernel
}  // namespace Elements
 
#endif  // ELEMENTSKERNEL_ELEMENTSKERNEL_PHYSCONSTANTS_H_