Question

Mercury boils at C. However, mercury thermometersĀ are made such that they can measureĀ temperatures up to C. This is done by :

A

maintaining vacuum above the mercury column in the steam of the thermometer

B

filling nitrogen gas at high pressure above the mercury column

C

filling nitrogen gas at low pressure above the mercury column

D

filling oxygen gas at high pressure above the mercury column

Medium

Solution

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Correct option is B)

By filling nitrogen gas above the mercury column, we are in fact increasing the boiling point of mercury. Mercury that can reach boiling point of , can now measure up to . Mercury separation in the capillary of the thermometer is filled by nitrogen gas and nitrogen being inert gas can minimize the oxidation of mercury.

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