What happens to the entropy of a system when it undergoes a reversible isothermal expansion?
Correct Answer: Entropy increases.
- Step 1: Understand what entropy is. Entropy is a measure of disorder or randomness in a system.
- Step 2: Know what a reversible isothermal expansion is. It is a process where a gas expands slowly at a constant temperature.
- Step 3: Recognize that during this expansion, the gas molecules move apart, increasing the disorder in the system.
- Step 4: Realize that as the gas expands, it does work on the surroundings, which also contributes to the change in entropy.
- Step 5: Conclude that because the disorder increases when the gas expands, the entropy of the system increases.
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