Chemical Process
Main use of liquid nitrogen is in

Rocket propulsion
Detergent manufacture
Refrigerative cooling
Making gun powder

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Chemical Process
Liquefaction of gases can not be done by

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

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