On what principle is a thermometer based?
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thermal expansion
These liquid thermometers are based on the principal of thermal expansion. When a substance gets hotter, it expands to a greater volume. Nearly all substances exhibit this behavior of thermal expansion. It is the basis of the design and operation of thermometers.
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Thermometers are based on the principle of expansion in liquids.
When temperature increases mercury inside the thermometer expands to give reading of temperature.
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