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.

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

  • Stefan - Boltzmann law — …   Useful english dictionary

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  • 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

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