Series of different colored lasers. No matter the color, the speed of light is a constant. The speed of light is just one constant in this table of common constants. Credit: Pang Ka kit, Creative Commons

Here is a useful table of common constants. These physical constants appear time and again in chemistry and physics homework problems.

Why memorize them when you can just look them up.

I personally prefer to keep a sheet with these constants stuffed in the back of book. You can print up your own sheet with a PDF copy of the Table of Common Constants.

### TABLE OF COMMON CONSTANTS

Name | Symbol | Value |

Speed of light | *c* | 299792458 m⋅s^{-1} |

Charge of an electron | *e* | 1.602176565(35)×10^{−19 }C |

Universal gravitational constant | G | 6.67384(80)×10^{-11} N⋅m^{2}/kg^{2} |

Planck’s constant | *h* | 6.626070040(81)×10^{−34} J⋅s |

| *h* | 4.135667662(25)×10^{−15} eV⋅s |

Dirac’s constant | *ħ* | 1.054571800(13)×10^{−34} J⋅s |

| *ħ* | 6.582119514(40)×10^{−16} eV⋅s |

Boltzmann’s constant | *k* | 1.3806488(13)×10^{−23} J⋅K^{-1} |

| | 8.6173324(78)×10^{−5} eV⋅K^{-1} |

Avogadro’s constant | N_{A} | 6.022140857(74)×10^{23} mol^{−1} |

Faraday’s constant | F | 96485.3365(21) C⋅mol^{−1} |

Ideal gas constant | R | 8.3144621(75) J⋅K^{−1}⋅mol^{−1} |

Mass of an electron | m_{e} | 9.10938291(40)×10^{−31} kg |

| | 0.510998928(11) MeV/*c*^{2} |

Mass of a proton | m_{p} | 1.672621777(74)×10^{−27} kg |

| | 938.272046(21) MeV/*c*^{2} |

Mass of a neutron | m_{n} | 1.674927351(74)×10^{−27} kg |

| | 939.565378(21) MeV/*c*^{2} |

Atomic mass unit | u, amu or Da | 1.660538921(73)×10^{−27} kg |

| | 931.494061(21) MeV/*c*^{2} |

Permittivity of free space | ε_{0} | 8.854187817×10^{−12} |

Coulomb’s constant | 1/4πε_{0} | 8.9875517973681764×10^{9} N⋅m^{2}⋅C^{-2} |

Permeability of free space | μ0 | 4π×10^{−7} N⋅A^{-2} |

Rydberg constant | R_{∞} | 1.0973731568539(55)×10^{−7} m^{-1} |

Bohr radius | a_{0} | 5.2917721092(17)×10^{−11} m |