For a constant volume gas thermometer, one should fill the gas at:

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Low temperature and low pressure

Low temperature and high pressure

High temperature and low pressure

High temperature and high pressure

answer is C.

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Detailed Solution

Concept: In order to fill the bulb of a constant-volume gas thermometer, ideal gas is used, as we are aware when answering this question. Since the intermolecular interaction between the gas molecules is almost nil at these temperatures and pressures, we now know that in order to create an ideal gas, these conditions must exist. As a result, we fill the gas at low pressure and high temperature.
At high temperatures and low pressures, a real gas behaves like an ideal gas. In order to improve the sensitivity of temperature measurement in a constant volume gas thermometer, one should load the gas at high temperature and low pressure.
Hence, the correct option is 3.

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