entropy in statistical mechanics

Entropy is a measure of the amount of disorder in a system at the microscopic level. In statistical mechanics, it is used to quantify the range of possibilities for the arrangement of particles in a system, and how likely each arrangement is to occur. The greater the entropy of a system, the greater the number of possible arrangements of its constituent particles, and the less order or organization there is in the system. It is a fundamental concept in thermodynamics, and provides a cornerstone for understanding many physical processes, from the behavior of gases to the formation of crystals.

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