Quantity

Symbol

Value

Speed of light in vacuum

c

299 792 458 m s^-1 (exact)

Permeability of vacuum

m ₀

4p ´ 10^-7 N.A^-2

= 12.566 370 614´ 10^-7 N A^-2 (exact)

permittivity of vacuum

e ₀

1/ m ₀c²

= 8.854 187 817 ´ 10^-12 F m^-1 (exact)

Newtonian constant of gravitation

G

6.672 ´ 10^-11 m³ kg^-1 s^-2

Planck constant

h

6.626 07´ 10^-34 J s=

4.135 669 ´ 10^-15 eV s

Elementary charge

e

1.602 177´ 10^-19 C

electron mass

m_e

9.109 38 ´ 10^-31 kg

Proton mass

m_p

1.672 623´ 10^-27 kg

Rydberg constant

R_¥

10 973 731.5 m^-1

Avogadro constant

N_A

6.022 13´ 10²³ mol^-1

Faraday constant N_Ae

F

96 485.3 C mol^-1

molar gas constant

R

8.314 5 J mol^-1 K^-1

Boltzmann constant, R/N_A

k

1.380 65´ 10^-23 J K^-1

=8.617 3´ 10^-5 eV K^-1

Stefan-Boltzmann constant

s

5.670 5´ 10^-8 W m^-2 K^-4

Wein displacement law constant

b

2.897 7´ 10^-3 m K

Electron volt

eV

1.602 177´ 10^-19 J

(unified) atomic mass unit

u=m_u=(1/12)m(C¹²)

1.660 54 ´ 10^-27 kg

Bohr magneton,

eh/2m_e = m _B

9.274 01 ´ 10^-24 J T^-1

= 5.788 382 ´ 10^-5 eV T^-1

Nuclear magneton

eh/2m_p =m _N

5.050 78 ´ 10^-27 J T^-1

= 3.152 451 ´ 10^-8 eV T^-1

Standard acceleration of gravity

g

9.806 65 m s^-2 (exact)

Standard atmosphere

atm

101 325 Pa (exact)