Discussion
Match each process with its entropy consequence.
List I
A. Reversible adiabatic expansion
B. Throttling of a real gas
C. Heat transfer across a finite difference
D. Reversible isothermal compression
List II
1. entropy is generated in the universe
2. entropy of the system is unchanged
3. system entropy falls and surroundings rise
4. entropy of the system increases
Answer: D
Each case is decided by whether the process is reversible and whether heat crosses the boundary. Sorting a process into the right box is the first step in any entropy analysis. Reversibility and heat transfer are the two questions to ask.
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