Stefan–Boltzmann law

Stefan–Boltzmann law

      statement that the total radiant heat energy emitted from a surface is proportional to the fourth power of its absolute temperature. Formulated in 1879 by Austrian physicist Josef Stefan (Stefan, Josef) as a result of his experimental studies, the same law was derived in 1889 by Austrian physicist Ludwig Boltzmann (Boltzmann, Ludwig Eduard) from thermodynamic considerations: if E is the radiant heat energy emitted from a unit area in one second and T is the absolute temperature (in degrees kelvin), then E = σT4, the Greek letter sigma (σ) representing the constant of proportionality, called the Stefan–Boltzmann constant. This constant has the value 5.6704 × 10−8 watt per metre2∙K4. The law applies only to blackbodies (blackbody), theoretical surfaces that absorb all incident heat radiation.

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Universalium. 2010.

См. также в других словарях:

  • Stefan–Boltzmann law — The Stefan–Boltzmann law, also known as Stefan s law, states that the total energy radiated per unit surface area of a black body in unit time (known variously as the black body irradiance, energy flux density, radiant flux, or the emissive… …   Wikipedia

  • stefan-boltzmann law — ˈshteˌfänˈbōltsˌmän noun Usage: usually capitalized S&B Etymology: after Josef Stefan died 1893 Austrian physicist, its formulator, & Ludwig Boltzmann died 1906 Austrian physicist who first demonstrated it : a statement in thermal radiation: the… …   Useful english dictionary

  • Stefan-Boltzmann law — /stef euhn bohlts meuhn/; Ger. /shte fahn bawlts mahn/, Physics. the law stating that the total energy radiated from a blackbody is proportional to the fourth power of its absolute temperature. Also called Stefan s law of radiation. [1895 1900;… …   Universalium

  • Stefan - Boltzmann law — …   Useful english dictionary

  • stefan's law — ˈshteˌfänz noun Usage: usually capitalized S Etymology: after Josef Stefan died 1893 : stefan boltzmann law …   Useful english dictionary

  • Stefan-Boltzmann-Gesetz — Das Stefan Boltzmann Gesetz ist ein physikalisches Gesetz, das die von einem ideal 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–Boltzmann constant — The Stefan–Boltzmann constant (also Stefan s constant), a physical constant denoted by the Greek letter σ, is the constant of proportionality in the Stefan–Boltzmann law: the total energy radiated per unit surface area of a black body in unit… …   Wikipedia

  • Stefan-Boltzmann’s radiant law — Stefano ir Bolcmano spinduliuotės dėsnis statusas T sritis fizika atitikmenys: angl. Stefan Boltzmann’s radiant law vok. Stefan Boltzmannsches Strahlungsgesetz, n rus. закон излучения Стефана Больцмана, m pranc. loi de Stefan Boltzmann, f …   Fizikos terminų žodynas

  • Stefan-Boltzmann’s law — Stefano ir Bolcmano dėsnis statusas T sritis Energetika apibrėžtis Spinduliuotės dėsnis, teigiantis, kad absoliučiai juodo kūno spinduliuojamos šilumos srauto tankis yra proporcingas kūno termodinaminei temperatūrai, pakeltai ketvirtuoju laipsniu …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • Stefan-Boltzmann radiation law — Смотри закон излучения Стефана Больцмана …   Энциклопедический словарь по металлургии


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