In radiation thermodynamics, the Stefan-Boltzmann law states that the total energy radiated per unit surface area of a black body in unit time, J, is directly proportional to the fourth power of the black body's thermodynamic temperature T:
where σ, called the Stefan–Boltzmann constant.
History
The law was deduced by Josef Stefan in 1879 on the basis of experimental measurements made by John Tyndall and was derived from theoretical considerations, using thermodynamics, by Ludwig Boltzmann (1844-1906) in 1884. [1] Boltzmann treated a certain ideal heat engine with the light as a working matter instead of the gas. The law is valid only for ideal black objects, the perfect radiators, called black bodies.
See also
● Thermodynamics of hell
References
1. Stefan, Jozef. (1879). "On the relationship between thermal radiation and temperature" (Über die Beziehung zwischen der Wärmestrahlung und der Temperatur). Bulletins from the sessions of the Vienna Academy of Sciences.
External links
● Stefan-Boltzmann law – Wikipedia.
