👉 In physics and statistics, an entropic quantity is a measure of entropy. It refers to a quantity that changes when its value increases or decreases. An example of an entropic quantity is the entropy change (ΔS) associated with a process. If ΔS > 0, it means the system has gained energy, while if ΔS < 0, it means the system has lost energy. The negative ΔS indicates that the system is at rest or in thermal equilibrium. In quantum mechanics
