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In statistical mechanics, entropy is an extensive property of a thermodynamic system. It is closely related to the number Ω of microscopic configurations that are consistent with the macroscopic quantities that characterize the system. Under the assumption that each microstate is equally probable, the entropy
is the natural logarithm of the number of microstates, multiplied by the Boltzmann constant kB. Formally,

### Types

### History

### Definitions and descriptions

### Second law of thermodynamics

### Applications

### Entropy change formulas for simple processes

### Approaches to understanding entropy

### Interdisciplinary applications of entropy