Chemical Engineering Thermodynamics
The thermodynamic law, PVy = constant, is not applicable in case of

Free expansion of an ideal gas
Ideal compression of air
Adiabatic expansion of steam in a turbine
Adiabatic compression of a perfect gas

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Chemical Engineering Thermodynamics
Free energy

Decreases in all spontaneous (or irreversible) processes
All of these
Remains unchanged in reversible processes carried at constant temperature and pressure
Change during a spontaneous process has a negative value

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