why is the Mercury prefered of ordinary 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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because Mercury is metal and it have high melting point and great surface tention
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