"The concept of entropy is central to the second law of thermodynamics."
https://en.wikipedia.org/wiki/Introduction_to_entropy
The driving force behind most macroscopic change is an increase in entropy. Entropy is the logarithmic measure of delocalization. The second law of thermodynamics can be stated as "Net localization is impossible." The second law permits localization, but only at the expense of greater delocalization elsewhere. Two examples: (1) A gas initially localized within part of a container will spontaneously delocalize to fill the entire container. The delocalization is in position space. (2) Matter will coalesce --- localize --- in position space under the influence of gravity only if friction damps its infall, with consequent delocalization of its directed kinetic energy of infall into undirected kinetic energy of heat. The delocalization is in momentum space; the directed momenta of infall are delocalized into random momenta of heat. The second law requires that the delocalization exceeds the localization. In the absence of friction the matter will simply bounce back out (unless there is enough of it in a small enough region of space to form a black hole, in which case the delocalization is onto the black hole's event horizon, the entropy of the black hole being proportional to the surface area of this horizon).
Entropy: A concept that is not a physical quantity
https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity
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