Stefan Boltzmann constant

The Boltzmann constant is the physical constant of proportionality in the Stefan–Boltzmann law, which states that the total intensity radiated over all wavelengths of a black body is proportional to the fourth power of the thermodynamic temperature.

Symbol
$\sigma$
Unit
W/m$^2$K$^4$
Formulae
$5.67036713e-08$
Used in
$\alpha_{st}$