Chemical Engineering Thermodynamics
At the critical point of a substance

There is no distinction between liquid and vapour phases
Liquid and vapour have the same density
The surface tension vanishes
All of these

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Chemical Engineering Thermodynamics
An irreversible process

Yields the maximum amount of work
Is an idealised visualisation of behaviour of a system
Yields an amount of work less than that of a reversible process
Is the analog of linear frictionless motion in machines

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