| Quantity |
Value |
| Speed of light in a vacuum (c) |
2.99792458E+08 m/s (exact) |
| Permeability of a vacuum (µ 0) |
4π×1.0E-07 H/m |
| Permittivity of a vacuum (ε 0) |
8.854187817...E-12 F/m |
| Elementary charge (of proton) |
1.60217733(49)E-19 C |
| Gravitational constant |
6.67259(85)E-11 Nm 2kg -2 |
| Unified atomic mass constant (m u = mass 12C / 12) |
1.6605402(10)E-27 kg |
| Rest mass of electron (m e) |
9.1093897(54)E-31 kg |
| 5.48579903(13)E-04 amu |
| Rest mass of proton (m p) |
1.6726231(10)E-27 kg |
| 1.007276470(12) amu |
| 1836.152701(37) m e |
| Rest mass of neutron (m n) |
1.6749286(10)E-27 kg |
| 1.008664904(14) amu |
| Energy equivalence of rest mass of electron |
0.5109906(15) MeV |
| Energy equivalence of rest mass of proton |
938.27231(28) MeV |
| Energy equivalence of rest mass of neutron |
939.56563(28) MeV |
| |
| Electron specific charge (-e/m e) |
-1.75881962(53)E11 C/kg |
| Planck constant |
6.6260755(40)E-34 Js |
| h/2π |
1.05457266(63)E-34 Js |
| Rydberg constant |
1.0973731534E+07 1/m |
| Fine structure constant |
7.29735308(33) |
| Reciprocal fine structure constant |
137.0359895(61) |
| Hartree energy |
4.3597482(26)E-18 J |
| 2.6255000E+06 J/mol |
| 27.211652 eV |
| 627.51E+03 Calories/mol (US Calorie) |
| Bohr radius |
5.29177249(24)E-11 m |
| Electron radius |
2.81794092(38)E-15 m |
| Compton wavelength of electron |
2.42631058(22)E-12 m |
| Compton wavelength of proton |
1.32141002(12)E-15 m |
| Compton wavelength of neutron |
1.31959110(12)E-15 m |
| |
| Avogadro constant (N A, L) |
6.0221367(36)E+23 1/mol |
| Faraday constant |
9.6485309(29)E+04 C/mol |
| Molar gas constant |
8.314510(70) J/K/mol |
| Boltzman constant |
1.380658(12)E-23 J/K |
| Stefan-Boltzman constant |
5.67051(19)E-08 W/m 2K -4 |
| First radiation constant |
3.7417749(22)E-16 Jm 2s -1 |
| Second radiation constant |
1.438769(12)E-02 mK |
| Bohr magneton |
9.2740154(31)E-24 J/T |
| Nuclear magneton |
5.0507866(17)E-27 J/T |
| Magnetic flux quantum |
2.06783461(61)E-15 Vs |
| |
| Gyromagnetic ratio of proton |
2.67522128(81)E+08 1/s/T |
| *1/2π |
4.2577469(13)E+07 Hz/T |
| in pure water |
2.67515255(81)E+08 1/s/T |
| *1/2π |
4.2756375(13)E+07 Hz/T |
| |
| Magnetic moment of electron |
9.2847701(31)E-24 J/T |
| in terms of Bohr magneton |
1.001159652(10) |
| |
| Magnetic moment of proton |
1.41060761(47)E-26 J/T |
| in terms of Bohr magneton |
1.521032202(15)E+03 |
| in pure water |
1.520993129(17)E+03 |
| in terms of nuclear magneton |
2.792847386(63) |
| |
| Electronvolts per mol |
96.485333E+03 J/mol |
| 23.060548E+03 Calories/mol |