| # Gaudi Framework, version v21r11 |

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# PhysicalConstants.py File Reference

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## Namespaces
namespace | PhysicalConstants
## Variables
float | PhysicalConstants::pi = 3.14159265358979323846
int | PhysicalConstants::twopi = 2
int | PhysicalConstants::halfpi = 2
| PhysicalConstants::pi2 = pi*pi
float | PhysicalConstants::Avogadro = 6.0221367e+23
float | PhysicalConstants::c_light = 2.99792458e+8
| PhysicalConstants::c_squared = c_light*c_light
float | PhysicalConstants::h_Planck = 6.6260755e-34
| PhysicalConstants::hbar_Planck = h_Planck/twopi
| PhysicalConstants::hbarc = hbar_Planck*c_light
| PhysicalConstants::hbarc_squared = hbarc*hbarc
| PhysicalConstants::electron_charge = -eplus
| PhysicalConstants::e_squared = eplus*eplus
float | PhysicalConstants::electron_mass_c2 = 0.51099906
float | PhysicalConstants::proton_mass_c2 = 938.27231
float | PhysicalConstants::neutron_mass_c2 = 939.56563
float | PhysicalConstants::amu_c2 = 931.49432
| PhysicalConstants::amu = amu_c2/c_squared
int | PhysicalConstants::mu0 = 4
int | PhysicalConstants::epsilon0 = 1
tuple | PhysicalConstants::elm_coupling = e_squared/(4*pi*epsilon0)
| PhysicalConstants::fine_structure_const = elm_coupling/hbarc
| PhysicalConstants::classic_electr_radius = elm_coupling/electron_mass_c2
| PhysicalConstants::electron_Compton_length = hbarc/electron_mass_c2
| PhysicalConstants::Bohr_radius = electron_Compton_length/fine_structure_const
| PhysicalConstants::alpha_rcl2 = fine_structure_const*classic_electr_radius*classic_electr_radius
| PhysicalConstants::twopi_mc2_rcl2 = twopi*electron_mass_c2*classic_electr_radius*classic_electr_radius
float | PhysicalConstants::k_Boltzmann = 8.617385e-11
float | PhysicalConstants::STP_Temperature = 273.15
int | PhysicalConstants::STP_Pressure = 1
int | PhysicalConstants::kGasThreshold = 10
int | PhysicalConstants::universe_mean_density = 1