Liquefaction of gases cannot be done by___________________?
Correct answer: C. Merely compressing it beyond critical pressure
- A. Exchange of heat with colder stream
- B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
- C. Merely compressing it beyond critical pressure
- D. Adiabatic expansion against a piston or in a turbine
Explanation
Pressure alone cannot liquefy a gas when the temperature is above its critical temperature, even if the pressure exceeds the critical pressure. Cooling, throttling with a suitable Joule-Thomson effect, or expansion work is also required.
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