Chemical Process
Liquefaction of gases can not be done by

Merely compressing it beyond critical pressure
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine

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Chemical Process
Unsaturated oils compared to saturated oils have

Higher melting point & higher reactivity to oxygen
Lower melting point & lower reactivity to oxygen
Higher melting point & lower reactivity to oxygen
Lower melting point & higher reactivity to oxygen

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