Physical Constants

Speed of light in vacuum
$c$	
$2.998\times 10^{+8}$ ${\rm m\,s}^{-1}$

Reduced Planck constant
$\hbar$
$1.055\times 10^{-34}$ ${\rm J\,s}$

Electric constant
$\epsilon_0$
$8.854\times 10^{-12}$ ${\rm F\,m}^{-1}$

Magnetic constant
$\mu_0$
$1.257\times 10^{-6}$ ${\rm N\,A}^{-2}$

Elementary charge
$e$
$1.602\times 10^{-19}$ C

Electron mass
$m_e$	
$9.109\times 10^{-31}$ kg

Proton mass
$m_p$
$1.673\times 10^{-27}$ kg


Gravitational constant
$G$	
$6.674\times 10^{-11}$ ${\rm m}^{3}\,{\rm kg}^{-1}\,{\rm s}^{-2}$

Ideal gas constant
$R$
$8.3145$ ${\rm J}\,{\rm mol}^{-1}\,{\rm K}^{-1}$


Avogadro constant
$N_A$	
$6.022\times 10^{+23}$ 

Source: Haynes and Lide 2011a.