Chemical Engineering Thermodynamics
Entropy of the system decreases, when

Water is converted into ice
Snow melts into water
A gas expands spontaneously from high pressure to low pressure
Both B & C

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

In which there is a temperature drop
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

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