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The constant volume gas thermometer works on the principle that

The constant volume gas thermometer works on the principle that Correct Answer at low pressure, the temperature of the gas is proportional of its pressure at constant volume

Concept:

A constant-volume gas thermometer is composed of a bulb that is attached to a mercury manometer. This thermometer operates on the principle of the Law of Gay-Lussac. The law states that when the temperature of an ideal gas increases, there is a corresponding increase in pressure. Also, when the temperature decreases, the pressure also decreases correspondingly.

A real gas behaves as an ideal gas at high temperature and low pressure. So, for a constant volume gas thermometer, one should fill the gas at high temperature and low pressure for better sensitivity of temperature measurement.

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