List of Physical Constants

Symbol

Description

Relative Uncertainty

${\mathrm{c}_0}$	Vacuum speed of light                     ${\mathrm{c}_0}{=}{299 792 458 \mathrm{m s^{-1}}}$	per definitionem [1]
${\mu_0}$	Vacuum permeability constant ${\mu_0}{=}{4\pi\times10^{-7}}{\mathrm{H m^{-1}}} {=}{12.56637...{\times}10^{-7} \mathrm{H m^{-1}}}$	per definitionem [1]
${\varepsilon_0}$	Vacuum permittivity constant ${\varepsilon_0} {=}{\frac{1}{{\mu_0} {{\mathrm{c}_0}}^2}} {=}{8.854187817...{\times}10^{-12} \mathrm{F m^{-1}}}$	per definitionem [1]
${h}$	PLANCK's constant                      ${h}{=}{6.6260693{\times}10^{-34} \mathrm{J s}}$	$1.7\times10^{-7}$  [1]
${k_{\mathrm{B}}}$	BOLTZMANN's constant             ${k_{\mathrm{B}}}{=} {1.3806503\! \times\! 10^{-23} \mathrm{J/K}}$	$1.8\times10^{-6}$  [1]
${\mathrm{N}_{\mathrm{L}}}$	LOSCHMIDT's number or AVOGADRO's constant ${\mathrm{N}_{\mathrm{L}}}{=}{6.0221415{\times}10^{23} \mathrm{mol^{-1}}}$	$1.7\times10^{-7}$  [1]
$q$	Elementary charge of an electron         $q {=}1.60217653 \times10^{-19} C$	$8.5\times10^{-8}$  [1]
${\mathrm{R}}$	Universal gas constant             ${\mathrm{R}}{=} {\mathrm{N}_{\mathrm{L}}}{k_{\mathrm{B}}}{=}{8.314472 \mathrm{J K^{-1} mol^{-1}}}$	$1.7\times10^{-6}$  [1]
${\sigma_{\mathrm{SB}}}$	STEFAN-BOLTZMANN's constant ${\sigma_{\mathrm{SB}}} {=}{\frac{2\pi^5{{k_{\mathrm{B}}}}^4}{15{{h}}^3{\mathrm{c}_0}}}{=}{5.6704{\times}10^{-8} \mathrm{W m^{-2} K^{-4}}}$	$7.0\times10^{-6}$  [1]