Fundamental Physical Constantsa^{a}

Quantity | Symbol | Value(s) |

Atomic mass unit or Dalton | amu, u, Da | 1.660538782 × 10^{−27} kg
931.494028 × 10^{6} eV/c^{2} |

Avogadro number | L, N_{A} | 6.02214179 × 10^{23} mol^{−1} |

Boltzmann constant | k | 1.3806504 × 10^{−23} J K^{−1} |

Elementary charge | e | 1.602176487 × 10^{−19} C |

Gravitational constant | G | 6.67428 × 10^{−11} m^{3} kg^{−1} s^{−2} |

Mass of electron | m_{e} | 9.10938215 × 10^{−31} kg
8.18710438 × 10^{−14} J/c^{2}
0.510998910 MeV/c^{2}
5.4857990943 × 10^{−4} u |

Mass of proton | m_{p} | 1.672621637 × 10^{−27} kg
1.503277359 × 10^{−10} J/c^{2}
938.272013 MeV
1.00727646677 u |

Molar gas constant | R | 8.314472 J K^{−1} mol^{−1}
0.08205746 L atm K^{−1} mol^{−1}
K for kelvin |

Permeability of vacuum Magnetic constant | μ_{0} | 4π × 10^{−7} N A^{−2}
N for newton and A for ampere. |

Permittivity of vacuum Electric constant | ε_{0} | 8.854187817 × 10^{−12} F m^{−1} |

Planck constant | h | 6.62606896 × 10^{−34} J s
4.13566733 × 10^{−15} ev s
6.62606896 × 10^{−27} erg s |

Speed of light in vacuum | c | 2.99792458 × 10^{8} m/s |

Stefan-Boltzmann constant | σ | 5.670400 × 10^{−8} W m^{−2} K^{−4}
W for watt |

^{a} Courtesy of the National Institute of Standards and Constants (NIST).