Astrophysics (index)

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 (BB) to its Temperature according to the Stefan-Boltzmann Law: the energy radiated by a black body is proportional to its surface and the fourth power of its temperature:

j* = σT4
  • j* - energy radiated per unit surface area
  • T - temperature
  • σ - Stefan-Boltzmann Constant

In SI units, it is:

σ = 5.67036713×10-8 W m-2 K-4

It can be derived from the Boltzmann Constant (k), Planck Constant (h), and the speed of light.


Referenced by:
Stellar Radius Determination
Stellar Structure