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Entropy, in thermodynamics, is a state function originally introduced to explain why part of a thermodynamic system's total energy is unavailable to do useful work.
Entropy may also refer to:
Thermodynamics and statistical mechanics
- Entropy (classical thermodynamics), thermodynamic entropy in purely macroscopic terms, with less emphasis on the statistical explanation
- Entropic force. The product of temperature and the gradient of the entropy density is viewed an effective force, yielding a gradient in the energy density of a system.
- Entropy (statistical thermodynamics), the statistical explanation of thermodynamic entropy based on probability theory
- Tsallis entropy, a generalization of Boltzmann-Gibbs entropy.
- von Neumann entropy, entropy in quantum statistical physics
- Introduction to entropy an explanation on entropy as a measure of irreversibility
- Entropy (order and disorder) an explanation of what heat and work have to do with disorder
- Entropy in thermodynamics and information theory, the relationship between thermodynamic entropy and information (Shannon) entropy
- Entropy (energy dispersal), dispersal of energy as a descriptor of entropy
- History of entropy
- Entropy and life, research concerning the relationship between the thermodynamic quantity entropy and the evolution of life
- Entropy (astrophysics), the adiabatic constant
Information theory and mathematics
- Entropy (information theory), also called Shannon entropy, a measure of the unpredictability or information content of a message source.
- Algorithmic entropy an (incomputable) measure of the information content of a particular message.
- Rényi entropies, a family of diversity measures generalising Shannon entropy; used to define fractal dimensions.
- Measure theoretic entropy, a measure of exponential growth in dynamical systems; equivalent to the rate of increase of Shannon entropy of a trajectory in trajectory-space.
- Topological entropy, a measure of exponential growth in dynamical systems; equivalent to the rate of increase of α->0 Renyi entropy of a trajectory in trajectory-space.
- Volume entropy, a Riemannian invariant measuring the exponential rate of volume growth of a Riemannian metric
- Maximum entropy (disambiguation)
Other uses in science and technology
- Entropy encoding, data compression strategies to produce a code length equal to the entropy of a message
- Entropy (computing), an indicator of the number of random bits available to seed cryptography systems
- Entropy (anesthesiology), a measure of a patient's cortical function, based on the mathematical entropy of EEG signals
- Entropy (ecology), measures of biodiversity in the study of biological ecology, based on Shannon and Rényi entropies
- Social entropy, a measure of the natural decay within a social system
Film and television
- Entropy (film), a 1999 film by Phil Joanou
- "Entropy" (Buffy episode)
- "Entropy" (Criminal Minds episode)
- Entropy (1977 board game)
- Entropy (1994 board game)
- Entropy (video game)
- Entropy or Alchemiss, a character in Freedom Force vs the 3rd Reich
- Entropy: A New World View, a book by Jeremy Rifkin and Ted Howard
- "Entropy", a 1960 short story by Thomas Pynchon
- "Entropy", a 1995 short story by Leanne Frahm
- Entropy (album), an album by Anathallo and Javelins
- Entropy / Send Them, an EP by DJ Shadow and the Groove Robbers
- "Entropy", a song by Bad Religion from Against the Grain
- "Entropy", a song by VNV Nation from Matter + Form
- "Entropy", a song by Moxy Früvous from The 'b' Album
- "Entropy", a song by MC Hawking
- "Entropy", a song by Grimes and Bleachers
- Entropia (album), an album by Pain of Salvation
- Entropy (package manager), a Sabayon Linux package manager
- Entropy (anonymous data store), a discontinued project to build a computer network designed to be resistant to censorship
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