This thermometer, called a Galileo thermometer, uses colored liquids of different densities to tell the temperature. The different liquids, encased in glass "bubbles" rise and fall as the temperature changes.

Photograph by Kelton Russenberger, MyShot
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thermometer
thermometer Encyclopedic Entry

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6 - 12 and up

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Geography

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A thermometer is an instrument that measures temperature.

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Photograph by Kelton Russenberger, MyShot

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