58 pi = 3.14159265358979323846
66 Avogadro = 6.0221367e23 / mole
72 c_light = 2.99792458e8 * m / s
73 c_squared = c_light * c_light
80 h_Planck = 6.62606896e-34 * joule * s
81 hbar_Planck = h_Planck / twopi
82 hbarc = hbar_Planck * c_light
83 hbarc_squared = hbarc * hbarc
88 electron_charge = -eplus
89 e_squared = eplus * eplus
95 electron_mass_c2 = 0.510998910 * MeV
96 proton_mass_c2 = 938.272013 * MeV
97 neutron_mass_c2 = 939.56536 * MeV
98 amu_c2 = 931.494028 * MeV
99 amu = amu_c2 / c_squared
105 mu0 = 4 * pi * 1.0e-7 * henry / m
106 epsilon0 = 1.0 / (c_squared * mu0)
111 elm_coupling = e_squared / (4 * pi * epsilon0)
112 fine_structure_const = elm_coupling / hbarc
113 classic_electr_radius = elm_coupling / electron_mass_c2
114 electron_Compton_length = hbarc / electron_mass_c2
115 Bohr_radius = electron_Compton_length / fine_structure_const
117 alpha_rcl2 = fine_structure_const * classic_electr_radius * classic_electr_radius
120 twopi * electron_mass_c2 * classic_electr_radius * classic_electr_radius
125 k_Boltzmann = 8.617343e-11 * MeV / kelvin
130 STP_Temperature = 273.15 * kelvin
131 STP_Pressure = 1.0 * atmosphere
132 kGasThreshold = 10.0 * mg / cm3
137 universe_mean_density = 1.0e-25 * g / cm3