Question

The entropy of an isolated system always __________ with time.

Answer 1

1. The system which doesn't interact with the surrounding is called an isolated system.
2. The universe is assumed as an isolated system.
3. According to the second law of thermodynamics, the entropy of an isolated system increases with time.
4. Thus, the entropy change of an isolated system can never be negative and it always increases.

Hence, the entropy of an isolated system always increases with time.