Question

Nitrogen is used in high-temperature thermometer :

• A. To prevent vaporization of mercury.
• B. To improve conductivity of mercury.
• C. To maintain mercury to remain in its state.
• D. To increase the specific heat capacity of mercury.

Answer 1

Answer: (A), (C)

The correct options are
A To prevent vaporization of mercury.
C To maintain mercury to remain in its state.

The principle used to measure temperature is that of the apparent thermal expansion of the liquid. An inert gas is used for mercury intended to high temperature. The thermometer is filled with an inert gas such as argon or nitrogen above the mercury to reduce its volatilization.

Hence, both options (A) and (C) are correct.