What does entropy measure? a. the change in phases of matter in a system b. the amount of energy in a system c. the change in temperature of a system d. the disorder of a system

D) the disorder of a system.

See, Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy also provides us with deep insight into the direction of spontaneous change for many everyday phenomenon like phase change in water.

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