Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Are prone to rancid oxidation
Have affinity to retain harmful sulphur compounds
Cause cholesterol build up and blood clotting
Always contain some amount of nickel (as their complete removal is very difficult)

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Chemical Process
Liquefaction of gases can not be done by

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

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