Category:Pyrometer

Py*rom"e*ter, n. Etym: [pyro- + -meter: cf. F. pyromètre.]

1. (physics)

Defn: an instrument used for measuring the expansion of solid bodies By heat.

2. (physics)

Defn: an instrument for measuring degrees of heat above those Indicated by the mercurial thermometer.

Note: 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.