why mercury is used in thermometer
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Mercury is used in thermometer because 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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Explanation:
it is because mercury gets heated and gets expand then it rises upward. As temperature decreases it contracts.
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