Chemical Process
Claude process of gas liquefaction employs

Joule-Thomson expansion cooling
Heat exchange with colder stream
Adiabatic expansion against a piston or in a turbine
Merely compression of gas beyond its critical pressure

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloroethane
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloromethane

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