Discussion
Which is the characteristic of entropy?
Answer: C
The characteristic of entropy named in the key is that it decreases when heat is removed, whether the temperature changes or not. Entropy of a system changes by \(\int \frac{dQ}{T}\) for a reversible process, so removing heat makes the integral negative and lowers the entropy of the system. The first statement is not what the key accepts, since entropy is unchanged in reversible adiabatic processes and increases in irreversible ones. The statement that it decreases when heat is supplied is the reverse of the truth, and the fourth statement about a throttling process is not the keyed statement.
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