Description
A thermometer is a device that measures temperature or a temperature gradient. A thermometer
has two important elements: a temperature sensor (e.g. the bulb of a mercury/alcohol-in-glass
thermometer) in which some physical change occurs with temperature, and some means of
converting this physical change into a numerical value (e.g. the visible scale that is marked on a
mercury-in-glass thermometer). Thermometers are widely used in industry to control and
regulate processes, in the study of weather, in medicine, and in scientific research.
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