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Physical Constants

Quantity

Symbol

Value

Units

Relative Uncertainty (ppm)

Speed of light in Vacuum

c

299 792 458

Ms-1

 (exact)

Permeability of vacuum

µ0

4С10-7

=12.566 370614

NA-2

10-7 NA-2

(exact)

Permittivity of vacuum

0

1/µ0c2

=8.854 187 817

10-12Fm-1

(exact)

Newtonian constant of gravitation

G

6.672 59

10-11m3kg-1s-2

128

Planck constant

h

6.626 0755

10-34Js

0.60

h/2

ħ

1.054 572 66

10-34Js

0.60

Elementary charge

e

1.602 177 33

10-19C

0.30

Magnetic flux quantum, h/2e

0

2.067 834 61

10-15Wb

0.30

Electron mass

me

9.109 3897

10-31kg

0.59

Proton mass

mp

1.672 6231

10-27kg

0.59

Proton-electron mass ratio

mp/me

1836.152701

0.020

Fine-structure constant, µ0ce2/2h

7.297 353 08

0.045

Inverse fine-structure constant

-1

137 035 9895

10-3

0.045

Rydberg constant, mec2/2h

R

10 973 731.534

m-1

0.0012

Avogadro constant

NAL

6.022 1367

1023mol-1

0.59

Faraday constant, NAe

F

96 485.309

C mol-1

0.30

Molar gas constant

R

8.314 510

J mol-1K-1

8.40

Boltzmann constant, R/NA

k

1.380 658

10-23JK-1

8.50

Stafan-Boltzmann constant, (2/60)k4/ħ3c2

5.670 51

10-8Wm-2K-4

34

Non-SI units used with SI

     Electronvolt, (e/C)J = {e}J

     (Unified) atomic mass unit, 1u=mu= 1/12m(12C)

eV

 u

 

1.602 17733

1.660 5402

 

10-19J

10-27kg

0.30

0.59


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