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  4. Mercury boils at 367°C . However, mercury thermometers are made such that they can measure temperature upto 500°C . This is done by

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Q. Mercury boils at $ 367^{\circ}C $ . However, mercury thermometers are made such that they can measure temperature upto $ 500^{\circ}C $ . This is done by

UPSEEUPSEE 2007

Solution:

If we fill nitrogen gas at high pressure above mercury level, the boiling point of mercury is increased which can extend the range upto $500^{\circ}C$.