Why do we use mercury or alcohol as thermometer liquids.

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Solution

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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The main advantage of mercury thermometer over alcohol thermometer is that mercury has greater boiling point than alcohol.

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