Entropy Definition

Chemistry Glossary Definition of Entropy

light contained in glass box
Entropy is a measure of the disorder or randomness of a system. PM Images/Getty Images

Entropy Definition

Entropy is the measure of the disorder of a system, usually denoted by the letter S. A highly ordered system has low entropy.

Example: ​

A block of ice will increase in entropy as it melts.

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Your Citation
Helmenstine, Anne Marie, Ph.D. "Entropy Definition." ThoughtCo, Feb. 7, 2017, thoughtco.com/definition-of-entropy-604458. Helmenstine, Anne Marie, Ph.D. (2017, February 7). Entropy Definition. Retrieved from https://www.thoughtco.com/definition-of-entropy-604458 Helmenstine, Anne Marie, Ph.D. "Entropy Definition." ThoughtCo. https://www.thoughtco.com/definition-of-entropy-604458 (accessed December 14, 2017).