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Namespaces | Variables
PhysicalConstants.h File Reference
`#include "GaudiKernel/SystemOfUnits.h"`
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## Namespaces
| Gaudi
| Helper functions to set/get the application return code.
| Gaudi::Units

## Variables
constexpr double | Gaudi::Units::pi = 3.14159265358979323846
constexpr double | Gaudi::Units::twopi = 2*pi
constexpr double | Gaudi::Units::halfpi = pi/2
constexpr double | Gaudi::Units::pi2 = pi*pi
constexpr double | Gaudi::Units::Avogadro = 6.0221367e+23/mole
constexpr double | Gaudi::Units::c_light = 2.99792458e+8 * m/s
constexpr double | Gaudi::Units::c_squared = c_light * c_light
constexpr double | Gaudi::Units::h_Planck = 6.6260755e-34 * joule*s
constexpr double | Gaudi::Units::hbar_Planck = h_Planck/twopi
constexpr double | Gaudi::Units::hbarc = hbar_Planck * c_light
constexpr double | Gaudi::Units::hbarc_squared = hbarc * hbarc
constexpr double | Gaudi::Units::electron_charge = - eplus
constexpr double | Gaudi::Units::e_squared = eplus * eplus
constexpr double | Gaudi::Units::electron_mass_c2 = 0.51099906 * MeV
constexpr double | Gaudi::Units::proton_mass_c2 = 938.27231 * MeV
constexpr double | Gaudi::Units::neutron_mass_c2 = 939.56563 * MeV
constexpr double | Gaudi::Units::amu_c2 = 931.49432 * MeV
constexpr double | Gaudi::Units::amu = amu_c2/c_squared
constexpr double | Gaudi::Units::mu0 = 4*pi*1.e-7 * henry/m
constexpr double | Gaudi::Units::epsilon0 = 1./(c_squared*mu0)
constexpr double | Gaudi::Units::elm_coupling = e_squared/(4*pi*epsilon0)
constexpr double | Gaudi::Units::fine_structure_const = elm_coupling/hbarc
constexpr double | Gaudi::Units::classic_electr_radius = elm_coupling/electron_mass_c2
constexpr double | Gaudi::Units::electron_Compton_length = hbarc/electron_mass_c2
constexpr double | Gaudi::Units::Bohr_radius = electron_Compton_length/fine_structure_const
constexpr double | Gaudi::Units::alpha_rcl2
constexpr double | Gaudi::Units::twopi_mc2_rcl2
constexpr double | Gaudi::Units::k_Boltzmann = 8.617385e-11 * MeV/kelvin
constexpr double | Gaudi::Units::STP_Temperature = 273.15*kelvin
constexpr double | Gaudi::Units::STP_Pressure = 1.*atmosphere
constexpr double | Gaudi::Units::kGasThreshold = 10.*mg/cm3
constexpr double | Gaudi::Units::universe_mean_density = 1.e-25*g/cm3