Chemical Process
Unsaturated oils compared to saturated oils have

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

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Chemical Process
Linde process of gas liquefaction employs

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

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