Constant

Symbol

Value

Acceleration due to gravity

g

9.806 m/s

Avogadro number

NA

6.0221367 × 10²³ particles mol⁻¹

Bohr magneton

μ_β

9.2740154 × 10⁻²⁴ J/T

Bohr radius

a₀

5.2917721092(17) × 10⁻¹¹ m

Boltzmann constant

k_B

6.6260755 × 10⁻³⁴ J × s

Classical electron radius

r_e

2.8179403267(27) × 10⁻¹⁵ m

Elementary charge

e

1.60217733 × 10⁻¹⁹ C

Faraday constant

F

9.64846 × 10⁴ C mol⁻¹

Free electron g factor

g_e

2.002319304

Gas constant

R

8.31451 m² × kg/s² × K × mol⁻¹

8.3144621 J K⁻¹ mol⁻¹

5.189 × 10¹⁹ eV K⁻¹mol⁻¹

0.08205746 L atm K⁻¹ mol⁻¹

1.9858775 cal K⁻¹ mol⁻¹

Mass—electron

m_e

9.1093897 × 10⁻³¹ kg

Mass—neutron

m_n

1.6749286 × 10⁻²⁷ kg

Mass—proton

m_p

1.6726231 × 10⁻²⁷ kg

Permeability of vacuum

μ₀

12.566370614 × 10⁻⁷ T² × m³/J

Permittivity of vacuum

ε₀

8.854187817 × 10⁻¹² C² J⁻¹ m⁻¹

Planck constant

h

6.6260755 × 10⁻³⁴J × s

Rydberg constant

R_∞

1.973731568539(55) × 10⁷ m⁻¹

Speed of light in a vacuum

c

2.99792458 × 10⁸ m/s

Stefan-Boltzmann Constant

Σ

5.670373 × 10⁻⁸ W × m⁻² × K⁻⁴