Physical Constants

Designation Symbol Numerical value Unit Velocity of light in vacuum c 2.998 108ms-1 Planck's constant h 6.626 10-34Js Boltzmann constant k 1.381 10-23JK-1 Permittivity of vacuum ε0 8.854 10-12Fm-1 Permeability of vacuum μ0 1.257 10-6Hm-1 Proton rest mass mp 1.673 10-27kg Neutron rest mass mn 1.675 10-27kg Electron rest mass me 9.110 10-31kg Electric elementary charge e 1.602 10-19C Specific electron charge e/me 1.759 1011Ckg-1 Mass energy relation  c2=e/m 8.988 1016Jkg-1 Electron radius re 2.818 10-15m Bohr radius a0 5.292 10-11m Compton wavelength of electron λc 2.426 10-12m Rydberg constant R∞ 1.097 107m-1 Avogadro constant NA 6.022 10-23mol-1 Molar volume Vm 2.241 10-2m3mol-1 Universal gas constant  R 8.315 Jmol-1K-1 Faraday constant F=NAe 9.648 104Cmol-1 Gravitational constant G 6.67 10-11Nm2kg-2 Gravitational acceleration  (at 450 lat and sea level) g 9.806 ms2