Question

why mercury is used in thermometer?????​

Answer 1

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.

Answer 2

Because it has high coefficient of expansion. And even a slight change in temperature is easily noticed.

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