Chemical Process
Hydrazine is largely used

As a starting material for 'hypo'
In photographic industry
As rocket fuel
In printing industry

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Chemical Process
Linde process of gas liquefaction employs

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

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