Entropy (disambiguation)

Entropy, in thermodynamics, is a property originally introduced to explain the part of the internal energy of a thermodynamic system that is unavailable as a source for useful work.

Look up entropy in Wiktionary, the free dictionary.

Entropy may also refer to:

Thermodynamics and statistical mechanics
  • Entropy (classical thermodynamics), thermodynamic entropy in 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 production. Development of entropy in a thermodynamic system.
  • Entropy (statistical thermodynamics), the statistical explanation of thermodynamic entropy based on probability theory
    • Configuration entropy, the entropy change due to a change in the knowledge of the position of particles, rather than their momentum
    • Conformational entropy, the entropy change due to a change in the "configuration" of a particle (e.g. a right-handed vs. a left-handed polyatomic molecule)
  • Tsallis entropy, a generalization of Boltzmann-Gibbs entropy
  • von Neumann entropy, entropy in quantum statistical physics and quantum information science

Introductory articles

Other aspects

Information theory and mathematics
  • Entropy (information theory), also called Shannon entropy, a measure of the unpredictability or information content of a message source
  • Differential entropy, a generalization of Entropy (information theory) to continuous random variables
    • Entropy of entanglement, related to the Shannon and von Neumann entropies for entangled systems; reflecting the degree of entanglement of subsystems
  • Algorithmic entropy an (incomputable) measure of the information content of a particular message
  • Rényi entropy, 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.
  • Topological entropy in physics
  • Volume entropy, a Riemannian invariant measuring the exponential rate of volume growth of a Riemannian metric
  • Maximum entropy (disambiguation)
  • Graph entropy, a measure of the information rate achievable by communicating symbols over a channel in which certain pairs of values may be confused.

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

Media
  • Entropy (choreography), the difference between a transcription and a performance

Film and television

Games
  • Entropy (1977 board game)
  • Entropy (video game)
  • Entropy or Alchemiss, a character in Freedom Force vs the 3rd Reich
  • N. Tropy, a character from Crash Bandicoot: Warped
  • Entropy: Zero, a Source mod for Half-Life 2 released in 2017 developed by Breadman
  • Entropy: Zero 2, a sequel to Entropy: Zero released in 2022
  • Entropy: Zero - Uprising, a mod of Entropy: Zero developed by Employee8 and Filipad

Literature
  • 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 (journal), a scientific journal published by MDPI
  • Entropy (magazine), an online literary magazine

Music
  • 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 Kelly Osbourne from Sleeping in the Nothing
  • "Entropy", a song by VNV Nation from Matter + Form
  • "Entropy", a song by Moxy Früvous from The 'b' Album
  • "Entropy", a song by Brymo from Oṣó
  • "Entropy", a song by Daniel Caesar from Case Study 01
  • "Entropy", a song by MC Hawking
  • "Entropy", a song by Grimes and Bleachers
  • Entropia (album), an album by Pain of Salvation
  • Entropy, a track by Nigel Stanford
  • The Book Of Us: Entropy, an album by DAY6

Software

Internet jargon
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