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A cavity is a hollow in an object. It may refer to: *Cavity or dental caries, a damage to the structure of a tooth *Body cavity, a fluid filled space in many animals where organs typically develop *Cavity (heat source), the regions formed between adjacent fins to extract heat from a variety of heat generating bodies to a heat sink *Cavity wall, a wall consisting of two skins with a cavity *Cavity (band), a sludge metal band from Miami, Florida *Cavity method, a mathematical method to solve some mean field type of models ==In radio frequency resonance== * Cavity Resonator, a device designed to select for waves of particular wavelengths * Optical cavity, the cavity resonator of a laser * Microwave cavity or ''RF cavity'', a cavity resonator in the radio frequency range, for example used in particle accelerators
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