A) maintaining vacuum above mercury column in the stem of the thermometer
B) filling nitrogen gas at high pressure above the mercury column
C) filling nitrogen gas at low pressure above the mercury level
D) filling oxygen gas at high pressure above the mercury column
Correct Answer: B
Solution :
By filling nitrogen gas at high pressure, the boiling point of mercury is increased which extend the range upto\[{{500}^{o}}C\].You need to login to perform this action.
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