Which metal is used in thermometers?

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(B) Mercury $(Hg)$ is the metal used in thermometers. It is a liquid at room temperature and has a high coefficient of thermal expansion,which allows

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Mercury

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(B) Mercury $(Hg)$ is the metal used in thermometers. It is a liquid at room temperature and has a high coefficient of thermal expansion,which allows it to expand and contract uniformly with temperature changes. Additionally,it has a high boiling point and does not stick to the glass walls of the thermometer,making it ideal for measuring temperature accurately.

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