Why can't air be liquefied by pressurization at room temperature?

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Abdolvahab Seif

Dear Dr. I think that there is critical temperature limitation.To have this goal, we should be under critical T of air.

Ali Ahmadi Peyghan

Yes, I know, Thanks for your answer. However, this is my question. Why can't air be liquefied by pressurization at room temperature (above critical T?