Physics reference
Constants
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PhysRef
Common constants from general physics, particle physics, and astrophysics.

Note.
Values and accuracies are from the Review of Particle Physics [reference 1] .

Italicized symbols represent variable names; nonitalicized symbols represent unit names.

The figures in parentheses after the values give the 1-standard-deviation uncertainties in the last digits.

Constants.
quantitysymbolvalue
acceleration due to gravity g 9.806 65 m/s2
age of Universe t0 15(5) Gy
atomic mass unit, unified u 931.494 32(28) MeV/c2 =
1.660 540 2(10) x 10-27 kg
astronomical unit au 1.495 978 706 6(2) x 1011 m
Avogadro constant NA 6.022 136 7(36) x 1023 mol-1
Bohr magneton muB 5.788 382 63(52) x 10-11 MeV/T
Bohr radius aoo 0.529 177 249(24) x 10-10 m
Boltzmann constant k 1.380 658(12) x 10-23 J/K =
8.617 385(73) x 10-5 eV/K
cosmic background energy density rhogamma 4.647 7 x 10-34 (T/2.726 K)4 g/cm3 =
0.260 71 (T/2.726 K)4 eV/cm3
cosmic background number density ngamma 410.89 (T/2.726 K)3 cm-3
cosmic background temperature T0 2.726 +- 0.005 K
critical density of Universe rhoc 2.775 366 27 x 1011 h02 MS Mpc-3 =
1.878 82(24) x 10-29 h02 g/cm3 =
1.053 94(13) x 10-5 h02 GeV/cm3
day, mean sidereal dsidereal 23h 56m 04s.090 53
deuteron (2H) mass md 1875.613 39(57) MeV/c2
Earth mass ME 5.973 70(76) x 1024 kg
Earth radius (equatorial) RE 6.378 140 x 106 m
electron charge magnitude e 1.602 177 33(49) x 10-19 C =
4.803 206 8(15) x 10-10 esu
electron mass me 0.510 999 06(15) MeV/c2 =
9.109 389 7(54) x 10-31 kg
electron radius, classical re 2.817 940 92(38) x 10-15 m
electron Compton wavelength lambdabare 3.861 593 23(35) x 10-13 m
entropy density/Boltzmann constant s/k 2.892 4 (T/2.726 K)3 cm-3
fine structure constant alpha 1/137.035 989 5(61)
gravitational constant GN 6.672 59(85) x 10-11 m3/(kg s2) =
6.707 11(86) x 10-39 h c/(GeV/c2)2
Hubble constant H0 100 h0 km/(s Mpc) =
h0/9.778 13 Gy
Hubble constant, normalized h0 0.5 < h0 < 0.85
jansky Jy 10-26 W/(m2 Hz)
light year (deprecated) ly 0.306 6... pc =
0.946 1... x 1016 m
Naperian (natural) logarithm base e 2.718 281 828 459 045 235
nuclear magneton muN 3.152 451 66(28) x 10-14 MeV/T
parsec (au/arcsec) pc 3.085 677 580 7(4) x 1016 m =
3.262... ly
permeability of free space mu0 4 pi x 10-7 N/A2 =
12.566 370 614... x 10-7 N/A2
permittivity of free space epsilon0 8.854 187 817... x 10-12 F/m
pi pi 3.141 592 653 589 793 238
Planck constant h 6.626 075 5(40) x 10-34 J s
Planck constant, reduced hbar 1.054 572 66(63) x 10-34 J s =
6.582 122 0(20) x 10-22 MeV s
Planck mass mP 1.221 047(79) x 1019 GeV/c2 =
2.176 71(14) x 10-8 kg
proton (1H) mass mp 938.272 31(28) MeV/c2 =
1.672 623 1(10) x 10-27 kg =
1.007 276 470(12) u =
1836.152 701(37) me
Rydberg energy h c Roo 13.605 698 1(40) eV
Schwarzschild radius of Sun 2 GN MS/c2 2.953 250 08 km
speed of light in vacuum c 299 792 458 m/s
Stefan-Boltzmann constant sigma 5.670 51(19) x 10-8 W/(m2 K4)
strong coupling constant alphas 0.118(3)
Sun distance from Core Ro 8.0(5) kpc
Sun luminosity LS 3.846 x 1026 W
Sun mass MS 1.988 92(25) x 1030 kg
Sun radius (equatorial) RS 6.96 x 108 m
Sun speed around Core Thetao 220(20) km/s
Sun speed to cosmic background 369.5 +- 3.0 km/s
Thompson cross section sigmaT 0.665 246 16(18) barn
W+- boson mass mW 80.33(15) GeV/c2
Wien displacement law constant b 2.897 756(24) x 19) x 10-3 m K
year, sidereal (fixed star to fixed star, 1994) ysidereal 31 558 149.8 s
year, tropical (equinox to equinox, 1994) y 31 556 925.2 s
Z0 boson mass mZ 91.187(7) GeV/c2
References.
1.
Physical Review D Particles and Fields

reference 1
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