An Etymological Dictionary of Astronomy and Astrophysics
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The flux of radiation from a blackbody is proportional to the fourth power of its absolute temperature: L = 4πR²σT⁴. Also known as Stefan's law.

Ludwig Eduard Boltzmann (1844-1906), an Austrian physicist, who made important contributions in the fields of statistical mechanics and statistical thermodynamics and Josef Stefan (1835-1893), an Austrian physicist; → law.