Name and Symbol | Value |
---|---|

Standard acceleration due to gravity (g) | $\mathbf{\equiv}$ 9.806 65 m/s^{2} |

Atomic mass unit (amu) | 1.660 5391 × 10^{−27} kg |

Avogadro’s number | $\mathbf{\equiv}$ 6.022 140 76 × 10^{23} mol^{−1} |

Boltzmann’s constant (k_{B}) |
$\mathbf{\equiv}$ 1.380 649 × 10^{−23} J K^{−1} |

Fundamental unit of charge (e) |
$\mathbf{\equiv}$ 1.602 176 634 × 10^{−19} C |

Electron rest mass (m)_{e} |
9.109 383 7015 × 10^{−31} kg |

Charge-to-mass ratio for electron (e/m)_{e} |
1.758 820 0109 × 10^{11} C kg^{−1} |

Faraday’s constant (F) |
$\mathbf{\equiv}$ 9.648 533 212 331 001 84 × 10^{4} C mol^{−1} |

gas constant (R) |
$\mathbf{\equiv}$ 8.314 462 618 153 24 J mol^{−1} K^{−1}
0.082 057 84 L atm mol ^{−1} K^{−1} 0.083 146 26 L bar mol ^{−1} K^{−1} |

Neutron rest mass (m)_{n} |
1.674 927 498 × 10^{−27} kg |

Planck’s constant (h) |
$\mathbf{\equiv}$ 6.626 070 15 × 10^{−34} J s |

Proton rest mass (m)_{p} |
1.672 621 923 × 10^{−27} kg |

Rydberg constant (R_{∞}) |
1.097 373 156 8160 × 10^{7} m^{-1} |

Rydberg unit of energy (R_{y} = hcR_{∞}) |
2.179 872 361 1035 × 10^{−18} J |

Speed of light (in vacuum) (c) |
$\mathbf{\equiv}$ 2.997 924 58 × 10^{8} m s^{−1} |

*Note: The symbol $\mathbf{\equiv}$ means “is defined as“. These definitions are exact (can be considered as infinite significant figures). All other values are measured.*

Values from NIST Committee on Data for Science and Technology (CODATA) Recommended Values: 2018

Values from NIST Committee on Data for Science and Technology (CODATA) Recommended Values: 2018