Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
Entropy change refers to the measure of disorder or randomness in a system. It's the difference in entropy (disorder) between the final and initial states in a process.
This law states that the total entropy of an isolated system can never decrease over time, and is constant if and only if all processes are reversible.