what is a bimetallic thermometer? answer in short
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The bimetallic thermometer is one of a large class of thermometers that depend on thermal expansion. In the bimetallic thermometer, two strips of metal (for instance, brass and invar) are joined together; the differential thermal expansion causes the strip to deflect when the temperature changes.
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Bimetal thermometers work on the principle that different metals expand at different rates as they are heated. By using two strips of different metals in a thermometer, the movement of the strips correlates to temperature and can be indicated along a scale.
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