Why is mercury used in thermometers?

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It volume is proportional to square of increase of temperature

It shows linear variation in volume with temperature

Its volume remains constant with temperature

Its volume decreases with increase in temperature

answer is B.

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Detailed Solution

For measuring temperature in a thermometer we need a substance whose physical properties change with temperature and can be easily related with temperature. Mercury’s volume increases linearly with increase in temperature and hence we can create a scale on the thermometer accordingly.

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