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Mechanical Properties Of Fluids

Question

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Mercury boils at 360°C though it can be used to measure the temperature upto 500°C. Explain how.

Solution

The mercury freezes at -39°C and boils at 360°C at normal pressure.
When nitrogen gas is filled in the stem of mercury thermometer, the range of mercury can be increased beyond 360°C.
With increase in temperature, the boiling point of liquid increases. When the mercury expands, the gas in the stem gets compressed and hence boiling point of mercury in the thermometer increases.

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