Chemical Process
Linde process of gas liquefaction employs

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

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Chemical Process
Nylon 66 is so named because the

Average degree of polymerisation of the polymer is 1966
Number of nitrogen atoms between two carbon atoms are 6
Polymer was first synthesised in 1966
Number of carbon atoms between two nitrogen atoms are 6

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