Thermodynamics

• Entropy (classical thermodynamics), the macroscopic approach to thermodynamic entropy
  • Entropy (energy dispersal)
    Entropy (energy dispersal)
    The description of entropy as energy dispersal provides an introductory method of teaching the thermodynamic concept of entropy. In physics and physical chemistry, entropy has commonly been defined as a scalar measure of the disorder of a thermodynamic system...
    
    , a variant perspective on thermodynamic entropy
• Entropy (statistical thermodynamics), the microscopic approach to thermodynamic entropy
• Gibbs entropy, statistical entropy of a thermodynamic system
  • Boltzmann entropy
    Boltzmann entropy
    In thermodynamics, specifically in statistical mechanics, the Boltzmann entropy is an approximation to the normal Gibbs entropy.The Boltzmann entropy is obtained if one assumes one can treat all the component particles of a thermodynamic system as statistically independent...
    
    , an approximation to Gibbs entropy
  • Tsallis entropy
    Tsallis entropy
    In physics, the Tsallis entropy is a generalization of the standard Boltzmann-Gibbs entropy. In the scientific literature, the physical relevance of the Tsallis entropy is highly debated...
    
    , a generalization of Boltzmann-Gibbs entropy
• von Neumann entropy
  Von Neumann entropy
  In quantum statistical mechanics, von Neumann entropy, named after John von Neumann, is the extension of classical entropy concepts to the field of quantum mechanics....
  
  , entropy of a quantum-mechanical system
• Entropy (order and disorder)
  Entropy (order and disorder)
  In thermodynamics, entropy is commonly associated with the amount of order, disorder, and/or chaos in a thermodynamic system. This stems from Rudolf Clausius' 1862 assertion that any thermodynamic processes always "admits to being reduced to the alteration in some way or another of the arrangement...
  
  , entropy's association with the amount of order, disorder, and/or chaos in a thermodynamic system
• History of entropy
  History of entropy
  The concept of entropy developed in response to the observation that a certain amount of functional energy released from combustion reactions is always lost to dissipation or friction and is thus not transformed into useful work...
  
  , concept of entropy that functional energy released from combustion reactions is always lost to dissipation or friction
• Introduction to entropy
  Introduction to entropy
  Entropy is a measure of how evenly energy is distributed in a system. In a physical system, entropy provides a measure of the amount of energy that cannot be used to do work....
  
  
• Entropy and life
  Entropy and life
  Research concerning the relationship between the thermodynamic quantity entropy and the evolution of life began in around the turn of the 20th century...
  
  , research concerning the relationship between the thermodynamic quantity entropy and the evolution of life
• Entropy (astrophysics)
  Entropy (astrophysics)
  In astrophysics, what is referred to as "entropy" is actually the adiabatic constant derived as follows.Using the first law of thermodynamics for a quasi-static, infinitesimal process for a hydrostatic systemdQ = dU-dW.\,...
  
  , the adiabatic constant

Information theory and mathematics

• Entropy (information theory), a measure of the amount of information contained in a message
• Entropy encoding
  Entropy encoding
  In information theory an entropy encoding is a lossless data compression scheme that is independent of the specific characteristics of the medium....
  
  , data compression strategies to produce a code length equal to the entropy of a message
• Kolmogorov–Sinai entropy, the rate of information generation by a measure-preserving dynamical system
• Rényi entropy
  Rényi entropy
  In information theory, the Rényi entropy, a generalisation of Shannon entropy, is one of a family of functionals for quantifying the diversity, uncertainty or randomness of a system...
  
  , a family of diversity measures used to define fractal dimensions
• Topological entropy
  Topological entropy
  In mathematics, the topological entropy of a topological dynamical system is a nonnegative real number that measures the complexity of the system. Topological entropy was first introduced in 1965 by Adler, Konheim and McAndrew. Their definition was modelled after the definition of the...
  
  , a measure of exponential growth in the number of distinguishable orbits of a dynamical system
• Volume entropy
  Volume entropy
  The volume entropy is an asymptotic invariant of a compact Riemannian manifold that measures the exponential growth rate of the volume of metric balls in its universal cover. This concept is closely related with other notions of entropy found in dynamical systems and plays an important role in...
  
  , a Riemannian invariant measuring the exponential rate of volume growth of a Riemannian metric

Computer science

• Entropy (computing)
  Entropy (computing)
  In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random data...
  
  , a discussion of entropy generation and API's in computer systems
• Entropy (package manager), a Sabayon Linux package manager
• Entropy (anonymous data store)
  Entropy (anonymous data store)
  Entropy was a decentralized, peer-to-peer communication network designed to be resistant to censorship, much like Freenet. Entropy was an anonymous data store written in the C programming language. It pooled the contributed bandwidth and storage space of member computers to allowed users to...
  
  , a discontinued project to build a computer network designed to be resistant to censorship

Music

• Entropy (album)
  Entropy (album)
  Entropy is a split vinyl album by Anathallo and Javelins. Each band has one song featured on the album, released in 2005 on Potential Getaway Driver. There were two pressings made, 300 in translucent green and later another 500 in clear vinyl....
  
  , an album by Anathallo and Javelins
• Entropy / Send Them
  Entropy / Send Them
  "Send Them/Entropy ", is a double A side EP by Asia Born and DJ Shadow and the Groove Robbers. This was released 1993 from Solesides...
  
  , a hip-hop suite by DJ Shadow and the Groove Robbers
• "Entropy", a song by Bad Religion from Against the Grain
  Against the Grain (Bad Religion album)
  -Release history:-Personnel:* Greg Graffin – vocals* Brett Gurewitz – guitar, backing vocals* Greg Hetson – guitar* Jay Bentley – bass guitar, backing vocals* Pete Finestone – drums* The Legendary Starbolt – mixing...
  
  
• "Entropy", a song by VNV Nation from Matter + Form
  Matter + Form
  Matter+Form is the fifth full-length album by futurepop artists VNV Nation. It was co-engineered by German trance DJ Humate and released on April 12, 2005. "Chrome" was released as a one-track single on 7 March.-Track listing:...
  
  
• "Entropy", a song by Moxy Früvous from The 'b' Album
  The 'b' Album
  The 'b' Album is a collection of B-sides and rarities released in 1996 by the Canadian folk band Moxy Früvous. A sticker on the packaging warned, "Not the third album!" At first self-published by the band, it was rereleased later that year with a revised track order in Canada by Warner Music...
  
  
• "Entropy", a song by MC Hawking
  MC Hawking
  Ken Lawrence is a nerdcore hip hop artist who purports to be theoretical physicist Stephen Hawking rapping under the name MC Hawking.MC Hawking gained some popularity on the Internet in the early 2000s...
  
  

Other uses

• Entropy (anesthesiology), a measure of a patient's cortical function
• Entropy (ecology), a measure of biodiversity in the study of biological ecology
• Social entropy
  Social entropy
  Social entropy is a macrosociological systems theory. It is a measure of the natural decay within a social system. It can refer to the decomposition of social structure or of the disappearance of social distinctions...
  
  , a measure of the natural decay within a social system
• Entropy (board game)
  Entropy (board game)
  There are at least two board games known under the name Entropy. Both are two-player abstract strategic games played on square boards.- Eric Solomon's Entropy :Eric Solomon's game was invented and published in 1977...
  
  
• "Entropy" (Buffy episode)
  Entropy (Buffy episode)
  "Entropy" is the 18th episode of season 6 of the television series Buffy the Vampire Slayer.- Plot synopsis :The Trio, riding ATVs, pursue two vampires through a cemetery; one of them throws a tree branch at Andrew, causing him to fall off and the others to crash. The vampires encounter Buffy and...
  
  
• Entropy (film)
  Entropy (film)
  Entropy is a movie directed by Phil Joanou, starring Stephen Dorff and featuring the Irish rock band U2. The film is largely autobiographical, covering his early film career, his relationships and his pet cat....
  
  , a 1999 film by Phil Joanou
• Entropy: A New World View
  Entropy: A New World View
  Entropy: A New World View is a non-fiction book by Jeremy Rifkin and Ted Howard, with an Afterword by Nicholas Georgescu-Roegen. First published by The Viking Press, New York in 1980 ....
  
  , a book by Jeremy Rifkin and Ted Howard
• "Entropy", a 1960 short story by Thomas Pynchon
  Thomas Pynchon
  Thomas Ruggles Pynchon, Jr. is an American novelist. For his most praised novel, Gravity's Rainbow, Pynchon received the National Book Award, and is regularly cited as a contender for the Nobel Prize in Literature...
  
  
• "Entropy", a 1995 short story by Leanne Frahm
  Leanne Frahm
  Leanne Frahm is an Australian writer of speculative short fiction.-Biography:Frahm was born in Brisbane, Queensland, Australia in 1946. She received her first nomination for her work in 1978 when she was a finalist for the 1979 Ditmar Award for best fan writer. The following year she won the best...