Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The pressure should be same in the two phases
The temperature of each phase should be same
The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases

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

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

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