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Stefan-Boltzmann constantThe Stefan-Boltzmann constant (also Stefan's constant), denoted with a Greek letter σ, is a derivable physical constant, the constant of proportionality between the total energy radiated per unit surface area of a black body in unit time and the fourth power of the thermodynamic temperature. Its value is 5.670 400(40) × 10-8 J s-1 m-2 K-4. See also Stefan-Boltzmann law.
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Stefan-Boltzmann constant".