Question

Why can’t a gas be condensed above critical temperature?

Answer 1

Answer:

A substance cannot form a liquid above its critical temperature, regardless of the applied pressure. Above the critical temperature, the molecules have enough kinetic energy to overcome the intermolecular attractive forces.

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Answer 2

Gases become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase. ... The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.