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

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

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Chemical Engineering Thermodynamics
An irreversible process

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

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