why mercury is uesd in thermometers?
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Because as it is in liquid state at room temperature and it expands with increase in temperature
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Good evening mate here's your answer-
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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