Stefan, Josef

▪ Austrian physicist
born March 24, 1835, St. Peter, Austria
died Jan. 7, 1893, Vienna

      Austrian physicist who in 1879 formulated a law which states that the radiant energy of a blackbody—a theoretical object that absorbs all radiation that falls on it—is proportional to the fourth power of its temperature. His law was one of the first important steps toward the understanding of blackbody radiation, from which sprang the quantum idea of radiation.

      At the University of Vienna, Stefan rose from lecturer in mathematical physics in 1858 to professor ordinarius of physics in 1863 and to director of the Physical Institute in 1866. Five years after he derived his law empirically, it was derived theoretically by Ludwig Boltzmann of Austria and hence became known as the Stefan–Boltzmann law.

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Universalium. 2010.

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  • STEFAN (JOSEF) — STEFAN JOSEF (1835 1893) Physicien autrichien né à Sankt Peter près de Klagenfurt et mort à Vienne. Les travaux originaux de Josef Stefan, intéressant des domaines importants de la physique, comprennent la théorie cinétique des gaz,… …   Encyclopédie Universelle

  • Stefan , Josef — (1835–1893) Austrian physicist Stefan was educated in his native Klagenfurt and at the University of Vienna. In 1863 he became professor of mathematics and physics at Vienna University and remained there for the rest of his life. Stefan s wide… …   Scientists

  • Stefan, Josef — ► (1835 93) Físico austríaco. Enunció una ley sobre la dependencia entre la radiación y la temperatura, demostrada después por Boltzmann. (V. Stefan Boltzmann.) …   Enciclopedia Universal

  • Stefan — Josef …   Scientists

  • Josef Stefan — Gedenktafel für Josef Stefan am Geburtshaus in der Ebentalerstraße 88 …   Deutsch Wikipedia

  • Josef Stefan — Josef Stefan. Josef Stefan (en esloveno Jožef Stefan) (24 de marzo de 1835 – 7 de enero de 1893) fue un físico, matemático y poeta, esloveno austríaco …   Wikipedia Español

  • Stefan — Stefan, Josef * * * (as used in expressions) Stefan Batory George, Stefan Lochner, Stefan Wyszynski, Stefan Zweig, Stefan …   Enciclopedia Universal

  • Stefan — (Josef) (1835 1893) physicien autrichien: travaux sur le rayonnement …   Encyclopédie Universelle

  • Stefan-Boltzmann-Konstante — Das Stefan Boltzmann Gesetz ist ein physikalisches Gesetz, das die von einem schwarzen Körper thermisch abgestrahlte Leistung in Abhängigkeit von seiner Temperatur angibt. Es ist benannt nach den Physikern Josef Stefan und Ludwig Boltzmann.… …   Deutsch Wikipedia

  • Stefan-Maxwell-Diffusion — Als Maxwell Stefan Diffusion (auch Stefan Maxwell Diffusion) wird ein Modell zur Beschreibung der Diffusion in Multikomponentensystemen bezeichnet. Die Gleichungen, die diese Transportvorgänge beschreiben, wurden von James Clerk Maxwell[1] für… …   Deutsch Wikipedia

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