Which of the following conditions is most favourable for converting a gas into liquid?

High pressure, low temperature

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Low pressure, low temperature

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Low pressure, high temperature

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High pressure, high temperature

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Solution

The correct option is A High pressure, low temperature
The liquid can be changed in phase transformation to a gas by evaporation and a gaseous phase can be changed into liquid by condensation under conditions of high pressure and low temperature. For example, to change nitrogen into a liquid we need to cool it down below about $- 200^{o} C$ and apply high pressure.

Option A is correct.

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