On what principle does a mercury thermometer work?

Thermal expansion of liquids

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Thermal expansion of gases

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Anomalous expansion of mercury

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Thermal expansion of solids

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Solution

The correct option is A Thermal expansion of liquids
Mercury thermometer work on the principle of thermal expansion of liquids. In case of mercury thermometer, mercury (liquid) expands when the temperature increases. This rise in the level of mercury gives the temperature readings. There is no anomalous expansion of mercury in reality.

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