Question

why is the temperature measured by a constant volume gas thermometer different from that measured by a resistance thermometer?

Answer 1

Answer:

A constant volume gas thermometer ususally consists of a bulb filled with a fixed amount of a dilute gas which is attached to a mercury manometer. The manometer is used to measure variation in pressure. This thermometer works on the principle of Law of Gay-Lussac.

Answer 2

Answer:

In constant volume gas thermometer the thermometric quantity is pressure and in case of constant pressure gas thermometer it is volume.

so the temperature differs