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Science Constants

Constant Symbol Value in SI units
acceleration of free fall g 9.806 65 m s-2
Avogadro constant L, LA. 6.0221367(36) x 1026( kg-mole)-1
Boltzmann constant k=R/NA 1.380658(12) x 10-23 J K-1
Permittivity Of Free Space e0 8.854187 817 x 10-12 F m-1
electronic charge e 1.602 177 33 (49) x 10-19 C
electronic rest mass me 9.1093897(54) x 10-31 kg
Faraday constant F 9.648 5309(29) x 107 C( kg-mole)-1
gas constant R. 8.314 510(70) x 103 J K-1 ( kg-mole)-1
gravitational constant G 6.672 59(85) x 10-11 m3 kg-1 s-2
Loschmidt’s Number NL 2.686 763(23) x 1025 m-3
magnetic constant m0 4 x (pi) x 10-7 H m-1
neutron rest mass mn 1.674 9286(10) x 10-27 kg
Planck constant h 6.626 0755(40) x 10-34 J s
proton rest mass mp 1.672 6231(10) x 10-27 kg
speed of light c 2.997 924 58 x 108 m s-1
Stefan-Boltzmann constant s 5.670 51(19) 10-8 W m-2 K-4


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Last Updated 29/11/2005