Py*rom"e*ter (?), n. [Pyro- + -meter: cf. F. pyrometre.]

1. Physics

An instrument used for measuring the expansion of solid bodies by heat.

2. 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.


© Webster 1913.

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