Question

The boiling point of mercury is $367^{\circ }C$ . A mercury thermometer can be used to measure a temperature of $500^{\circ }C$

• A. by filling the space above mercury with oxygen at high pressure
• B. by filling the space above mercury with nitrogen at low pressure
• C. by filling the space above mercury with nitrogen at high pressure
• D. by keeping the space above mercury as vacuum

Answer 1

Answer: (C)

In order to increase the boiling point, high pressure must be required. Hence, temperature can be raised to $500^{\circ }C$ from $367^{\circ }C$ by filling the space above mercury with nitrogen at high pressure.