Chemical Engineering Thermodynamics
The adiabatic throttling process of a perfect gas is one of constant enthalpy

In which there is a temperature drop
Which is exemplified by a non-steady flow expansion
In which there is an increase in temperature
Which can be performed in a pipe with a constriction

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Chemical Engineering Thermodynamics
Free energy

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

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