Question

How did Stefan Boltzmann find the constant to the Stefan Boltzmann law?

Answer 1

The Stefan-Boltzmann constant is named after two individuals - Joseph Stefan who empirically found this constant and Ludwig Boltzmann who derived it from the first principles.

Answer 2

Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.