Which of the following are the most favourable conditions for liquefyi

Which of the following are the most favourable conditions for liquefying a gas ?

Low pressure and high temperature

Low pressure and low temperature

High pressure and high temperature

High pressure and low temperature

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

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Liquefying a gas requires bringing its molecules closer together and reducing their kinetic energy so that intermolecular attractive forces become dominant. This is best achieved by applying high pressure (to reduce the space between molecules) and lowering the temperature (to reduce molecular motion).

– High pressure forces gas molecules closer, increasing the likelihood of intermolecular attractions.
– Low temperature reduces the kinetic energy of molecules, allowing attractive forces to overcome disruptive thermal motion.
– Every gas has a critical temperature above which it cannot be liquefied by pressure alone, regardless of how high the pressure is. Liquefaction is only possible at or below the critical temperature.

Below the critical temperature, the substance is called a vapor, and it can be liquefied by applying sufficient pressure. Above the critical temperature, it remains a gas even under high pressure; increasing pressure only increases its density, forming a supercritical fluid above the critical pressure. Therefore, high pressure and low temperature relative to the critical point are the most favorable conditions.

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