The Stefan-Boltzmann law, a relation which describes…

The Stefan-Boltzmann law, a relation which describes the power radiated from a black body in terms of its temperature, is deduced by Jožef Stefan (1835–1893) in 1879 on the basis of experimental measurements made by John Tyndall and is derived from theoretical considerations, using thermodynamics, by Ludwig Boltzmann in 1884.

Boltzmann, a professor at the University of Graz, had considered a certain ideal heat engine with light as a working matter instead of gas.

The law is valid only for ideal black objects, the perfect radiators, called black bodies.

Stefan publishes this law in the article Über die Beziehung zwischen der Wärmestrahlung und der Temperatur (On the relationship between thermal radiation and temperature) in the Bulletins from the sessions of the Vienna Academy of Sciences.