Physical constants

spaceweb@oulu.fi - last update: 23 November 1998, 1700 UT (RR)

Speed of light in vacuum 2.998 × 108 m/s
Permittivity of vacuum 8.854 × 10-12 F/m
Permeability of vacuum 4 × pi × 10-7 H/m
Planck's constant 6.626 × 10-34 Js
Boltzmann's constant 1.381 × 10-23 J/K
Gravitational constant 6.671 × 10-11 Nm2/kg2
Charge of proton 1.602 × 10-19 C
Rest mass of proton 1.673 × 10-27 kg
Rest mass of electron 9.109 × 10-31 kg
Rest mass of neutron 1.675 × 10-27 kg
Proton/electron mass ratio 1836
Unified atomic mass unit 1.661 × 10-27 kg
Bohr radius 5.292 × 10-11 m
Classical electron radius 2.818 × 10-15 m
Avogadro's number 6.022 × 1023 mol-1
Loschmidts's number 2.687 × 1025 m-3
Molar volume at STP 22.4 × 10-3 m3/mol
Gas constant 8.314 J/(K mol)
Standard acceleration of gravity 9.807 m/sec2

See also:

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