Physical Constants

Constant
Symbol
Magnitude
Avagadro's Number
NA
6.023 x 1023 molecules/mole
Boltzmann's constant
k
1.38 x 10-23 J/K = 8.62 x 10-5 eV/K
Electronic charge
q
1.6 x 10-19 C
Electronvolt
eV
1.6 x 10-19 J
Planks constant
h
6.625 x 10-34 J-s
Thermal voltage at 300 oK
Vt
25.8 mV
Velocity of light
c
3 x 1010 cm/s
Permeability of free space
uo
1.257 x 10-8 H/cm
Permittivity of free space
eo
8.854 x 10-14 F/cm
Free-electron mass
m
9.1 x 10-31 kg