Stefan's law

British  

/ ˈstɛfənz /

noun

1. Also called: Stefan-Boltzmann law.  the principle that the energy radiated per second by unit area of a black body at thermodynamic temperature T is directly proportional to T ⁴ . The constant of proportionality is the Stefan constant, equal to 5.670400 × 10 ^–8 Wm ^–2 K ^–4

---

Etymology

Origin of Stefan's law

C19: named after Josef Stefan (1835–93), Austrian physicist

Example Sentences

This however is the amount of radiation measured by the Bolometer, and to get the temperature of the radiating surface we must apply Stefan's law of the 4th power.

From Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation by Wallace, Alfred Russel

So far as the experimental results available at that time were concerned, Stefan’s law could be regarded only as an empirical expression of doubtful significance.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" by Various