Entropy—as originally conceived—is a mathematical term representing the quantity of energy no longer available for work. Since there is more than one type of entropy, we will refer to this kind as ...

Entropy also increases in initially ordered quantum systems until it reaches a final state of disorder. Entropy and the direction of time Equating 'entropy' with 'disorder' is not entirely correct.

Entropy is one of the most useful concepts in science but also one of the most confusing. This article serves as a brief introduction to the various types of entropy that can be used to quantify the ...