Under what conditions, can a gas be cooled and converted into liquid?

1.	Under what conditions, can a gas be cooled and converted into liquid?
A.	At its critical temperature by decreasing pressure on it
B.	Above its critical temperature by increasing pressure on it
C.	Above its critical temperature by decreasing pressure on it
D.	Below its critical temperature by increasing pressure on it
Answer» E.

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Under what conditions, can a gas be cooled and converted into liquid?

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