The Stefan-Boltzmann Constant is a physical constant relating the power radiated from a Black Body to its Temperature according to the Stefan-Boltzmann Law (i.e., Stefan-Boltzmann Equation, different from the Boltzmann Equation): the energy radiated by a black body is proportional to its surface and the fourth power of its temperature:
j* = σT4
In SI units, it is:
σ = 5.67036713×10-8 W m-2 K-4
It can be derived from the Boltzmann Constant, Planck Constant, and the speed of light.