Will an increase or decrease in pressure help to liquefy a gas?

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Solution

The process of converting a matter from its gaseous state to liquid state is known as liquefaction of gases.
An increase in pressure at a lower temperature helps to liquefy a gas.
This happens because gases have large intermolecular space which allows them to be compressed upon applying pressure.
Once compressed, the intermolecular space decreases. As a result intermolecular force among particles increases and the gas changes to liquid.

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