mutationpp / Mutationpp

The MUlticomponent Thermodynamic And Transport library for IONized gases in C++
GNU Lesser General Public License v3.0
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Add Stefan-Boltzmann constant to `Constants.h` #251

Closed mgoodson-cvd closed 6 months ago

mgoodson-cvd commented 7 months ago

Add the Stefan-Boltzmann constant,

\sigma =\frac { 2 \pi^{5} k_B^{4} }{ 15 c^{2} h^{3} } \approx 5.670374419 \times 10^{−8} \mathrm{W} \mathrm{m}^{−2} \mathrm{K}^{−4}.

This is used in a couple places in the GSI routines, e.g., here, and it would be better to have it defined with the other constants.