Physical constants

Quantity
Symbol
Value (cgs units)
Value (eV units)
speed of light (in vacuum)
c
2.99792458 × 1010 cm s-1
Newton's gravitational constant
G
6.6743 × 10-8 cm3 g-1 s-2
Planck's constant
h
6.6261 × 10-27 cm2 g s-1
4.1357 × 10-15 eV s
reduced Planck's constant
ℏ = h/2π
1.0546 × 10-27 cm2 g s-1
6.5821 × 10-16 eV s
Boltzmann's constant
k
1.3807 × 10-16 cm2 g s-2 K-1
8.6173 × 10-5 eV K-1
Stefan-Boltzmann constant
σ
5.6704 × 10-5 g s-3 K-4
electron charge
e
4.8032 × 10-10 cm3/2 g1/2 s-1
electron mass
me
9.1094 × 10-28 g
0.511 MeV/c2
proton mass
mp
1.6726× 10-24 g
938.272 MeV/c2
neutron mass
mn
1.6749× 10-24 g
939.563 MeV/c2
atomic mass unit
u
1.6605 × 10-24 g
931.494 MeV/c2
erg (unit of energy)
erg
1 cm2 g s-2
6.2415 × 1011 eV

Astronomical constants

Quantity
Symbol
Value (cgs units)
Solar mass
M
1.9884 × 1033 g
Earth mass
M
5.9722 × 1027 g
Jupiter mass
MJ
1.8981 × 1030 g
Solar radius
R
6.957 × 1010 cm
Earth radius
R
6.3781 × 108 cm
Jupiter radius
RJ
7.1492 × 109 cm
Solar luminosity
L
3.828 × 1033 erg s-1
astronomical unit
AU
1.496 × 1013 cm
parsec
pc
3.086 × 1018 cm
light-year
ly
9.461 × 1017 cm
year
yr
3.156 × 107 s

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Last updated: January 18, 2018 swj