From Glossary of Meteorology
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An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states.

Thermometers may be classified into six types according to their construction: gas thermometer, liquid-in-glass thermometer, deformation thermometer, electrical thermometer, liquid-in- metal thermometer, and sonic thermometer.
See also thermograph.

Middleton, W. E. K., and A. F. Spilhaus 1953. Meteorological Instruments. 3d ed., rev., . 67–92.