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
The third law of thermodynamics states that the

Heat transfer from low temperature to high temperature source is not possible without external work
Heat capacity of a crystalline solid is zero at absolute zero temperature
Gases having same reduced properties behave similarly
None of these

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