Selected Physical Constants
Constant
|
Symbol
|
Value
|
Units
|
Avogadro's Number
|
N0
|
6.022 x 1023
|
molecules / mol
|
Boltzmann constant
|
k
|
1.381 x 10-23
|
J/K
|
Electron charge
|
e
|
1.602 x 10-19
|
C
|
Permittivity constant
|
E0
|
8.854 x 10-12
|
F/m
|
Velocity of light
|
c
|
2.998 x 108
|
m/s
|
Gas constant
|
R
|
8.314
|
J/mol K
|
Planck constant
|
h
|
6.626 x 10-34
|
J s
|
Electron rest mass
|
me
|
9.110 x 10-31
|
kg
|
Proton mass
|
mp
|
1.673 x 10-27
|
kg
|
Neutron mass
|
mn
|
1.675 x 10-27
|
kg
|
Permeability constant
|
µ0
|
4*pi x 10-7
|
H/m
|
Bohr magneton
|
µH
|
9.274 x 10-24
|
Am2
|
Mass-energy relation
|
c2
|
8.99 x 1016
|
J/kg
|
Gravitational Constant
|
G
|
6.67 x 10-11
|
Nm2/kg2
|
Standard Earth Gravity
|
g
|
9.81
|
m/s2
|