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Liquefaction of gases can not be done by | |
A. | exchange of heat with colder stream. [Wrong Answer] |
B. | adiabatic expansion through a throttle valve (Joule-Thomson expansion). [Wrong Answer] |
C. | merely compressing it beyond critical pressure. [Correct Answer] |
D. | adiabatic expansion against a piston or in a turbine. [Wrong Answer] |