Question

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

• 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

Answer 1

Answer: (B)

filling nitrogen gas at high pressure above the mercury column

Answer 2

Answer (b) filling nitrogen gas at high pressure above the mercury column