A thermometer is a device that measures
temperature or
temperature gradient, using a variety of different principles. The word thermometer is derived from two smaller word fragments: thermo from the Greek for
heat and meter from
Greek, meaning to measure. A thermometer has two important elements, the temperature sensor (e.g. the bulb on a mercury thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a value (e.g. the scale on a mercury thermometer). Industrial thermometers commonly use electronic means to provide a digital display or input to a computer.
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