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Other disciplines, such as chemistry, have taken entropy to also mean the dispesal of particles. Thus there are instances where both particles and energy disperse at different rates when substances are mixed together. Yet other disciplines such as information sciences have developed concepts such as [[information entropy]]. Thermodynamic (heat) entropy may also involve [[statistical mechanics]], which describes entropy on the microscopic level.
==Slightly more technical definitions==
Traditionally, 20th century chemistry textbooks have described entropy as "a measurement of the disorder or randomness of a system".{{fact}} Modern chemistry textbooks have increasinly tended to say: "Entropy measures the spontaneous dispersal of energy... — at a specific temperature."{{fact}}
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