| Quantity | Symbol | Value |
|---|
| [permeability of vacuum]? | μ | 4π x 10-7 H.m-1 (defined) |
| speed of light in vacuum | c | 299 792 458 m.s-1 (defined) |
| [permittivity of vacuum]? | ε0 = 1/μ0c02 | 8.854 187 816 ... x 10-12 F.m-1 |
| Planck's constant | h | 6.626 075 5(40) x 10-34 J.s |
| | h_strikethrough = h/2π | 1.054 572 66(63) x 10-34 J.s |
| [elementary charge]? | e | 1.602 177 33(49) x 10-19 C |
| electron rest mass | me | 9.109 389 7(54) x 10-31 kg |
| proton rest mass | mp | 1.672 623 1(10) x 10-27 kg |
| neutron rest mass | mn | 1.674 928 6(10) x 10-27 kg |
| [atomic mass constant]?, (unified atomic mass unit) | mu = 1u | 1.660 540 2(10) x 10-27 kg |
| [Avogadro constant]? | L, NA | 6.022 136 7(36) x 1023 mol-1 |
| [Boltzmann constant]? | k | 1.380 658(12) x 10-23 J.K-1 |
| [Faraday constant]? | F | 9.648 530 9(29) x 104 C.mol-1 |
| gas constant | R | 8.314 510 (70) J.K-1.mol-1 |
| zero of the Celsius scale | | 273.15 K (defined) |
| molar volume, ideal gas, p = 1 bar, θ = 00C | | 22.711 08(19) L.mol-1 |
| standard atmosphere | atm | 101 325 Pa (defined) |
| [fine structure constant]? | α = μ0e2c0/2h | 7.297 353 08(33) x 10-3 |
| | α-1 | 137.035 989 5(61) |
| [Bohr radius]? | a0 | 5.291 772 49(24) x 10-11 m |
| [Hartree energy]? | Eh | 4.359 748 2(26) x 10-18 J |
| [Rydberg constant]? | Rinfinity | 1.097 373 153 4(13) x 10-7 m-1 |
| [Bohr magneton]? | μB | 9.247 015 4(31) x 10-24 J.T-1 |
| [electron magnetic moment]? | μe | 9.284 770 1(31) x 10-24 J.T-1 |
| Lande g-factor for free electron | ge | 2.002 319 304 386(20) |
| [nuclear magneton]? | μN | 5.050 786 6(17) x 10-27 J.T-1 |
| proton magnetic moment | μp | 1.410 607 61(47) x 10-26 J.T-1 |
| proton magnetogyric ratio | γp | 2.675 221 28(81) x 108 s-1.T-1 |
| magnetic moment of protons in H20, μ'p | μ'p/μB | 1.520 993 129(17) x 10-3 |
| proton resonance frequency per field in H20 | γ'p/2π | 42.576 375 (13) M.Hz.T-1 |
| [Stefan-Boltzmann constant]? | σ | 5.670 51(19) x 10-8 W.m-2.K-4 |
| first radiation constant | c1 | 3.741 774 9(22) x 10-16 W.m2 |
| second radiation constant | c2 | 1.438 769 (12) x 10-2 m.K |
| [gravitational constant]? | G | 6.672 59(85) x 10-11 m3.kg-1.s-2 |
| standard acceleration of free fall | gn | 9.80665 m.s-2 (defined) |
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