# C – Fundamental Constants

Quantity | Symbol | Value |
---|---|---|

Atomic mass unit | ||

Avogadro’s number | ||

Bohr magneton | ||

Bohr radius | ||

Boltzmann’s constant | ||

Compton wavelength | ||

Coulomb constant | ||

Deuteron mass | ||

Electron mass | ||

Electron volt | ||

Elementary charge | ||

Gas constant | ||

Gravitational constant | ||

Neutron mass | ||

Nuclear magneton | ||

Permeability of free space | (exact) | |

Permittivity of free space | (exact) | |

Planck’s constant | ||

Proton mass | ||

Rydberg constant | ||

Speed of light in vacuum | (exact) |

**Table C1**Fundamental Constants

### Useful combinations of constants for calculations:

at

### Candela Citations

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