Chemical Process
Liquefaction of gases can not be done by

Merely compressing it beyond 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
Enzymes are

Derived from living organisms
Catalyst for temperature sensitive reactions
All of these
Proteins with high molecular weight (around 10, 000)

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