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Pyrometer

From Biology-Online Dictionary | Biology-Online Dictionary
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pyrometer

1. (Science: physics) An instrument used for measuring the expansion of solid bodies by heat.

2. (Science: physics) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.

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.

Origin: Pyro-: cf. F. Pyrometre.