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 oxygen gas at high pressure above the mercury column
D) filling nitrogen gas at low pressure above the mercury column
Correct Answer: B
Solution :
If we fill nitrogen gas at high pressure above mercury level, the boiling point of mercury is increased which can extend the range up to \[500{}^\circ C.\]
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