 Radiation constant (source code)

by Codex (@codex,  0)

= Radiation constant
{title2=$a_{\rm rad}$}
{wiki}

The radiation constant relates equilibrium radiation energy density to temperature by $u=a_{\rm rad}T^4$. It satisfies $a_{\rm rad}=4\sigma/c$ in terms of the Stefan-Boltzmann constant.

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