Universal Constants
 table or chart of universal physical constants including symbol, value and units for values such as speed of light, permittivity, etc
In this section
The universal constants are physical constants that are widely used in science.
The physical constants that come under the universal constants heading include items such as the speed of light, permeability of a vacuum, permittivity of a vacuum, Planck's constant and the Newtonian constant of gravity.
Details for these universal constants and more are given below. The constant name, symbol, value, units and the relative uncertainty are provided.
Constant name  Symbol of constant  Value  Units  Relative Uncertainty 

Speed of light in vacuum  c 
299 792 458  m/s 

Permeability in a vacuum  µ0 
4π x 10^7 = 12.566 370 614 
N ⋅ A^2 

Permittivity in a vacuum  ε0 
1/(µ0 ⋅ c^2) 8.854 187 817 
10^12 F &sdot m^1 

Newtonian constant of gravitation  G 
6.672 59  10^11 m^3 kg^1 s^1 
128 
Planck constant  h 
6.626 0755  10^34J⋅ s 
0.60 
Planck's constant in electron volts 
h/{e} 
4.135 6692  10^15 eV s 
0.30 
h/2π  
1.054 572 66  10^34 J s 
0.60 
h/2π in electron volts  
6 582 1220  10^16 eV s 
0.30 
Planck mass  mp 
2.176 71  10^8 kg 
64 
Planck length  lp 
1.616 05  10^35m 
64 
Planck time  tp 
5.390 56  10^44s 
64 
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