### 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*^{*} = σ*T*^{4}

*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,
Planck Constant, and the speed of light.

(*physics,constant*)
http://en.wikipedia.org/wiki/Stefan-Boltzmann_constant

**Referenced by:**

Stellar Radius Determination

Stellar Structure

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