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Physical Constants

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ConstantsSymbolsValues
Speed of Lightc3×108 m/s
Planck Constant

h

hc

 6.63×10−34 Js

1242 eV-nm 

Gravitation constant

G
6.67×10−11 m3 kg−1 s−2
Boltzmann constant
k
1.38×10−23 J/K
Molar gas constant
R
8.314 J/(mol K)
Avogadro’s number
NA
6.023×1023 mol−1
 Charge of electron

1.602×10−19 C
Permeability of vacuum
µ0
4π×10−7 N/A2
Permitivity of vacuum

8.85×10−12 F/m 
Coulomb constant

9×109 N m2/C2
Faraday constant
F
96485 C/mol
Mass of electron
me
9.1×10−31 kg
Mass of proton
 mp
1.6726×10−27 kg
Mass of neutron
mn
1.6749×10−27 kg
Atomic mass unit
u
1.66×10−27 kg
Atomic mass unit
u
931.49 MeV/c2
Stefan-Boltzmann constant
σ
5.67×10−8 W/(m2 K4)
Rydberg constant
R∞
1.097×107 m−1
Bohr magneton 
µB
9.27×10−24 J/T
Bohr radius
a0
0.529×10−10 m
Standard atmosphere
atm
1.01325×105 Pa
Wien Displacement Constantb2.9 × 10-3 m K