Chemical Process
Thermosetting plastic materials

Can not be melted after forming
Can be repeatedly melted
Is useful for spinning
Is useful for melt casting

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Chemical Process
Linde process of gas liquefaction employs

Exchange of heat with colder stream
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)

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