Stefan-Boltzmann Constant

${\sigma }_B=\frac{{\pi }^2{k}_B^4}{60{\hslash }^3{c}^2}\approx 5.670374419\cdot 10^{-8}\frac{\mathrm{W}}{{\mathrm{m}}^2{\mathrm{K}}^4}$

• Used in Stefan-Boltzmann Law
• $k_B$ is the Boltzmann Constant
• Desmos Demo: shows equivalency of above quantities

$s_B=\frac{{\pi }^2}{15{\hslash }^3{c}^2}$