(?), n. [Pyro- + -meter: cf. F. pyromtre.] 1. (Physics) An instrument used for measuring the expansion of solid bodies by heat.
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2. (Physics) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.
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It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current.
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} a. [Cf. F. pyromtrique.] (Physics) Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.
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Wed 12th May 2021