Entropy is a fundamental scientific concept that quantifies the statistical probability of a system's state. It is a universal measure of multiplicity.
Entropy may also refer to: Science and technology Physics Entropy (classical thermodynamics), thermodynamic entropy in macroscopic terms, with less emphasis on the statistical explanation 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 Entropy (order and disorder), the relationship of disorder with heat and work 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 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 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 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 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
Arts and entertainment Film and television Entropy (film), a 1999 film by Phil Joanou "Entropy" (Buffy episode), 2002 "Entropy", an episode of Criminal Minds season 11
Games Entropy (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, a 2005 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 Beach Bunny from Emotional Creature "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
Other uses in arts and entertainment Entropy (choreography), the difference between a transcription and a performance
Other uses Entropy (package manager), a Sabayon Linux utility Exluna Entropy, computer graphics rendering software Information entropy, relating to disruptive actions taken in Internet vigilantism
See also