Here is a useful table of common physical 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 my textbook. You can download and print up your own list of important physical constants using the link below.

### Physical Constants PDF Download

### Common Physical Constants

AName | 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} C^{2}/N·m^{2} |

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

Permeability of free space | μ_{0} | 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 |

I could have used this sheet when I was a chem major