what is the use of mercury in thermometer?
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Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.
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Answer:Mercury has a higher coefficient of expansion than water, which means that changes in its volume with temperature are more noticeable.
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