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Stefan-Boltzmann Constant

(σ, Stefan's Constant)
(relates radiation power to temperature and surface area)

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.


Referenced by:
Stellar Radius Determination
Stellar Structure