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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Chemical Process
Fusel oil is a/an

Extract from medicinal herbs
None of these
Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses)
Essential oil

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