The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants

Constants
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alpha particle mass in u
atomic mass constant
atomic mass constant energy equivalent
atomic mass constant energy equivalent in MeV
Avogadro constant
Boltzmann constant
Boltzmann constant in eV/K
Boltzmann constant in Hz/K
Boltzmann constant in inverse meter per kelvin
characteristic impedance of vacuum
deuteron mass in u
electron mass in u
Faraday constant
first radiation constant
first radiation constant for spectral radiance
helion mass in u
Loschmidt constant (273.15 K, 100 kPa)
Loschmidt constant (273.15 K, 101.325 kPa)
molar gas constant
molar mass constant
molar mass of carbon-12
molar Planck constant
molar volume of ideal gas (273.15 K, 100 kPa)
molar volume of ideal gas (273.15 K, 101.325 kPa)
muon mass in u
natural unit of momentum in MeV/c
neutron mass in u
neutron-proton mass difference in u
Newtonian constant of gravitation over h-bar c
proton mass in u
reduced Planck constant times c in MeV fm
Rydberg constant times c in Hz
Sackur-Tetrode constant (1 K, 100 kPa)
Sackur-Tetrode constant (1 K, 101.325 kPa)
second radiation constant
speed of light in vacuum
Stefan-Boltzmann constant
tau mass in u
triton mass in u
vacuum electric permittivity
vacuum magnetic permeability
Wien frequency displacement law constant
Wien wavelength displacement law constant


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