Chemical Process
Linde process of gas liquefaction employs

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

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Chemical Process
Wax is a

Mixture of glycerides of fatty acids
Liquid at room temperature
Mixture of glycerides
Mixture of esters of polyhydric alcohols excepting glycerine

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