| c |
speed of light in vacuum |
299 792 458 m⋅s-1 |
0 |
| h |
Planck constant |
6.626 070 15×10-34 J⋅Hz-1 |
0 |
| ℏ =h/2π |
reduced Planck constant |
1.054 571 817...×10-34 J⋅s |
0 |
| k,kB |
Boltzmann constant |
1.380 649×10-23 J⋅K-1 |
0 |
| G |
Newtonian constant of gravitation |
6.674 30(15)×10-11 m3⋅kg-1⋅s-2 |
2.2×10-5 |
| Λ |
cosmological constant |
1.089(29)×10-52 m−21.088(30)×10-52 m-2 |
0.0270.028 |
| σ =π2kB4/60ℏ3c2 |
Stefan–Boltzmann constant |
5.670 374 419...×10-8 W⋅m-2⋅K-4 |
0 |
| c1=2πhc2 |
first radiation constant |
3.741 771 852...×10-16 W⋅m2 |
0 |
| c1L=2hc2/sr |
first radiation constant for spectral radiance |
1.191 042 972...×10-16 W⋅m2⋅sr-1 |
0 |
| c2=hc/kB |
second radiation constant |
1.438 776 877...×10-2 m⋅K |
0 |
| b |
Wien wavelength displacement law constant |
2.897 771 955...×10-3 m⋅K |
0 |
| b' |
Wien frequency displacement law constant |
5.878 925 757...×1010 Hz⋅K-1 |
0 |
| bentropy |
Wien entropy displacement law constant |
3.002 916 077...×10-3 m⋅K |
0 |
| e |
elementary charge |
1.602 176 634×10-19 C |
0 |
| G0=2e2/h |
conductance quantum |
7.748 091 729...×10-5 S |
0 |
| G0-1=h/2e2 |
inverse conductance quantum |
12906.403 72... Ω |
0 |
| RK=h/e2 |
von Klitzing constant |
25812.807 45... Ω |
0 |
| KJ=2e/h |
Josephson constant |
483597.8484...×109 Hz⋅V-1 |
0 |
| Φ0=h/2e |
magnetic flux quantum |
2.067 833 848...×10-15 Wb |
0 |
| α =e2/4πε0ℏc |
fine-structure constant |
0.007 297 352 5643(11) |
1.6×10-10 |
| α-1 |
inverse fine-structure constant |
137.035 999 177(21) |
1.6×10-10 |
| μ0=4παℏ/e2c |
vacuum magnetic permeability |
1.256 637 061 27(20)×10−6 N⋅A-2 |
1.6×10-10 |
| Z0=4παℏ/e2 |
characteristic impedance of vacuum |
376.730 313 412(59) Ω |
1.6×10-10 |
| ε0=e2/4παℏc |
vacuum electric permittivity |
8.854 187 8188(14)×10-12 F⋅m-1 |
1.6×10-10 |
| me |
electron mass |
9.109 383 7139(28)×10-31 kg |
3.1×10-10 |
| mμ |
muon mass |
1.883 531 627(42)×10-28 kg |
2.2×10-8 |
| mτ |
tau mass |
3.167 54(21)×10-27 kg |
6.8×10-5 |
| mp |
proton mass |
1.672 621 925 95(52)×10-27 kg |
3.1×10-10 |
| mn |
neutron mass |
1.674 927 500 56(85)×10-27 kg |
5.1×10-10 |
| mp/me |
proton-to-electron mass ratio |
1836.152 673 426(32) |
1.7×10-11 |
| mW/mZ |
W-to-Z mass ratio |
0.881 45(13) |
1.5×10-4 |
| sin2θW =1-(mW/mZ)2 |
sine-square weak mixing angle |
0.223 05(23) 0.231 21(4) 0.231 53(4) |
1.0×10-3 1.7×10-4 1.7×10-4 |
| ge |
electron g-factor |
2.002 319 304 360 92(36) |
1.8×10-13 |
| gμ |
muon g-factor |
2.002 331 841 23(82) |
4.1×10-10 |
| gp |
proton g-factor |
5.585 694 6893(16) |
2.9×10-10 |
| h/2me |
quantum of circulation |
3.636 947 5467(11)×10-4 m2⋅s-1 |
3.1×10-10 |
| μB=eℏ/2me |
Bohr magneton |
9.274 010 0657(29)×10-24 J⋅T-1 |
3.1×10-10 |
| μN=eℏ/2mp |
nuclear magneton |
5.050 783 7393(16)×10-27 J⋅T-1 |
3.1×10-10 |
| re=αℏ/mec |
classical electron radius |
2.817 940 3205(13)×10-15 m |
4.7×10-10 |
| σe=(8π/3)re2 |
Thomson cross section |
6.652 458 7051(62)×10-29 m2 |
9.3×10-10 |
| a0=ℏ/αmec |
Bohr radius |
5.291 772 105 44(82)×10-11 m |
1.6×10-10 |
| R∞=α2mec/2h |
Rydberg constant |
10973731.568 157(12) m-1 |
1.1×10-12 |
| Ry=R∞hc=Eh/2 |
Rydberg unit of energy |
2.179 872 361 1030(24)×10-18 J |
1.1×10-12 |
| Eh=α2mec2 |
Hartree energy |
4.359 744 722 2060(48)×10-18 J |
1.1×10-12 |
| GF/(ℏc)3 |
Fermi coupling constant |
1.166 3787(6)×10-5 GeV-2 |
5.1×10-7 |
| NA |
Avogadro constant |
6.022 140 76×1023 mol-1 |
0 |
| R=NAkB |
molar gas constant |
8.314 462 618 153 24 J⋅mol-1⋅K-1 |
0 |
| F=NAe |
Faraday constant |
96485.332 123 310 0184 C⋅mol-1 |
0 |
| NAh |
molar Planck constant |
3.990 312 712 893 4314×10-10 J⋅s⋅mol-1 |
0 |
| M(12C)=NAm(12C) |
molar mass of carbon-12 |
12.000 000 0126(37)×10-3 kg⋅mol-1 |
3.1×10-10 |
| mu=m(12C)/12 |
atomic mass constant |
1.660 539 068 92(52)×10-27 kg |
3.1×10-10 |
| Mu=M(12C)/12 |
molar mass constant |
1.000 000 001 05(31)×10-3 kg⋅mol-1 |
3.1×10-10 |
| Vm(Si) |
molar volume of silicon |
1.205 883 199(60)×10-5 m3⋅mol-1 |
4.9×10-8 |
| ΔνCs |
hyperfine transition frequency of 133Cs |
9192631770 Hz |
0 |