Friday, February 24, 2006

Stefan's Law

Definition: The total energy radiated per unit surface area of a black body in unit time is proportional to the fourth power of its thermodynamic temperature. The constant of proportionality, the Stefan-Boltzmann constant has the value 5.6697*10-8 J s-1 m-2 K-4. The law was discovered by the Austrian physicist Joseph Stefan (1853-93) and theoretically derived by Ludwig Boltzmann.

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