Physical Constants

Speed of light in vacuum

c

2.9979245800e+8 m s^-1

Planck constant

h

6.6260701500e-34 J s

Elementary charge

e

1.6021766340e-19 C

Avogadro constant

N_A

6.0221407600e+23 mol^-1

Boltzmann constant

k_B

1.3806490000e-23 J K^-1

Newtonian constant of gravitation

G

6.6743000000e-11 m^3 kg^-1 s^-2

Fine-structure constant

α

0.0072973525693 dimensionless

Electron mass

m_e

9.1093837015e-31 kg

Proton mass

m_p

1.6726219237e-27 kg