Why mecury is use in thermometer
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Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.
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Mercury is used in thermometer because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it is used in thermometer. It also has a high boiling point which makes it very suitable to measure high temperatures.
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