C - Fundamental Constants


QuantitySymbolValue
Atomic mass unitu

Avogadro’s numberNA
Bohr magneton
Bohr radius
Boltzmann’s constant
Compton wavelength
Coulomb constant
Deuteron mass




Electron mass




Electron volt
Elementary chargee
Gas constantR
Gravitational constantG
Neutron mass


Nuclear magneton
Permeability of free space


(exact)
Permittivity of free space


(exact)
Planck’s constanth



Proton mass


Rydberg constant
Speed of light in vacuumc

(exact)


Table C1 Fundamental Constants



Note: These constants are the values recommended in 2006 by CODATA, based on a least-squares adjustment of data from different measurements. The numbers in parentheses for the values represent the uncertainties of the last two digits.



Useful combinations of constants for calculations









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