Universal Constants

- table or chart of universal physical constants including symbol, value and units for values such as speed of light, permittivity, etc

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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