Which of the following property is used as thermometric property in constant – volume gas thermometer?

Explanation:

• In order to obtain a quantitative measure of temperature, a reference body is used, and a certain physical characteristic of this body which changes with temperature is selected.
• The changes in the selected characteristics may be taken as an indication of the change in temperature.
• The selected characteristic is called the thermometric property, and the reference body which is used in the determination of temperature is called a thermometer.

• A constant-volume gas thermometer uses the thermometric property pressure for the measurement of temperature.
• The volume of gas is set constant by raising or lowering a mercury reservoir while temperature changes.
• The pressure is indicated by the level difference in mercury in the tube.

Various types of thermometers and their thermometric property are mentioned in the table below.