Units Index 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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