In radiation thermodynamics, a cavity whose walls are in radiative equilibrium with the radiant energy within the cavity.

This idealized cavity can be approximated in practice by making a small perforation in the walls of a hollow container of any opaque material. The radiation escaping through such a perforation will be a good approximation to black-body radiation at the temperature of the interior of the container.

See also: Blackbody, Blackbody Radiation.

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Subjects: Physics