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Entropy, in thermodynamics, is a measure of the unavailability of a system’s energy to do work.
Entropy may also refer to:
Information and computer science
- Kolmogorov–Sinai entropy, the rate of information generation by a measure-preserving dynamical system
- Topological entropy, a measure of exponential growth in the number of distinguishable orbits of a dynamical system
- Volume entropy, a Riemannian invariant measuring the exponential rate of volume growth of a Riemannian metric