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

low temperature and low pressure

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low temperature and high pressure

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high temperature and low pressure

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high temperature and high pressure

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Solution

The correct option is D high temperature and low pressure
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.
option (C) the correct answer

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