Constants.
quantity
acceleration due to gravity
age of Universe
symbol
g
t0
atomic mass unit, unified
u
astronomical unit
Avogadro constant
Bohr magneton
Bohr radius
au
NA
muB
aoo
Boltzmann constant
k
cosmic background energy density
ργ
cosmic background number density
cosmic background temperature
nγ
T0
critical density of Universe
ρc
day, mean sidereal
deuteron (2H) mass
Earth mass
Earth radius (equatorial)
dsidereal
md
ME
RE
electron charge magnitude
e
electron mass
me
electron radius, classical
electron Compton wavelength
entropy density/Boltzmann constant
fine structure constant
re
λe
s/k
α
gravitational constant
GN
Hubble constant
H0
Hubble constant, normalized
jansky
h0
Jy
light year (deprecated)
ly
Naperian (natural) logarithm base
e
value
2
9.806 65 m/s
15(5) Gy
931.494 32(28) MeV/c2 =
1.660 540 2(10) x 10-27 kg
1.495 978 706 6(2) x 1011 m
6.022 136 7(36) x 1023 mol-1
5.788 382 63(52) x 10-11 MeV/T
0.529 177 249(24) x 10-10 m
1.380 658(12) x 10-23 J/K =
8.617 385(73) x 10-5 eV/K
4.647 7 x 10-34 (T/2.726 K)4 g/cm3 =
0.260 71 (T/2.726 K)4 eV/cm3
410.89 (T/2.726 K)3 cm-3
2.726 +- 0.005 K
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
23h 56m 04s.090 53
1875.613 39(57) MeV/c2
5.973 70(76) x 1024 kg
6.378 140 x 106 m
1.602 177 33(49) x 10-19 C =
4.803 206 8(15) x 10-10 esu
0.510 999 06(15) MeV/c2 =
9.109 389 7(54) x 10-31 kg
2.817 940 92(38) x 10-15 m
3.861 593 23(35) x 10-13 m
2.892 4 (T/2.726 K)3 cm-3
1/137.035 989 5(61)
6.672 59(85) x 10-11 m3/(kg s2) =
6.707 11(86) x 10-39 h c/(GeV/c2)2
100 h0 km/(s Mpc) =
h0/9.778 13 Gy
0.5 < h0 < 0.85
10-26 W/(m2 Hz)
0.306 6... pc =
0.946 1... x 1016 m
2.718 281 828 459 045 235
nuclear magneton
parsec (au/arcsec)
permeability of free space
permittivity of free space
pi
Planck constant
Planck constant, reduced
Planck mass
proton (1H) mass
Rydberg energy
Schwarzschild radius of Sun
speed of light in vacuum
Stefan-Boltzmann constant
strong coupling constant
Sun distance from Core
Sun luminosity
Sun mass
Sun radius (equatorial)
Sun speed around Core
Sun speed to cosmic background
Thompson cross section
W+- boson mass
Wien displacement law constant
year, sidereal (fixed star to fixed star, 1994)
year, tropical (equinox to equinox, 1994)
Z0 boson mass
3.152 451 66(28) x 10-14 MeV/T
3.085 677 580 7(4) x 1016 m =
pc
3.262... ly
4 pi x 10-7 N/A2 =
mu0
12.566 370 614... x 10-7 N/A2
ε0
8.854 187 817... x 10-12 F/m
pi
3.141 592 653 589 793 238
h
6.626 075 5(40) x 10-34 J s
1.054 572 66(63) x 10-34 J s =
hbar
6.582 122 0(20) x 10-22 MeV s
1.221 047(79) x 1019 GeV/c2 =
mP
2.176 71(14) x 10-8 kg
938.272 31(28) MeV/c2 =
1.672 623 1(10) x 10-27 kg =
mp
1.007 276 470(12) u =
1836.152 701(37) me
h c Roo
13.605 698 1(40) eV
2
2 GN MS/c 2.953 250 08 km
c
299 792 458 m/s
σ
5.670 51(19) x 10-8 W/(m2 K4)
αs
0.118(3)
Ro
8.0(5) kpc
LS
3.846 x 1026 W
MS
1.988 92(25) x 1030 kg
RS
6.96 x 108 m
θo
220(20) km/s
369.5 +- 3.0 km/s
σT
0.665 246 16(18) barn
mW
80.33(15) GeV/c2
b
2.897 756(24) x 19) x 10-3 m K
ysidereal
31 558 149.8 s
y
31 556 925.2 s
mZ
91.187(7) GeV/c2
muN