Entropy

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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:

Thermodynamics

• Entropy (classical thermodynamics), the macroscopic approach to thermodynamic entropy
• Entropy (statistical thermodynamics), the microscopic approach to thermodynamic entropy
• Gibbs entropy, statistical entropy of a thermodynamic system
  • Boltzmann entropy, an approximation to Gibbs entropy
  • Tsallis entropy, a generalization of Boltzmann-Gibbs entropy
• von Neumann entropy, entropy of a quantum-mechanical system
• Entropy (order and disorder), entropy's association with the amount of order, disorder, and/or chaos in a thermodynamic system
• History of entropy, concept of entropy that functional energy released from combustion reactions is always lost to dissipation or friction
• Introduction to entropy
• Entropy and life, research concerning the relationship between the thermodynamic quantity entropy and the evolution of life
• Entropy (astrophysics), the adiabatic constant

Information and computer science

• Entropy (information theory) (Shannon entropy), a measure of the amount of information contained in a message
• Rényi entropy, a family of diversity measures used to define fractal dimensions
• Entropy encoding, data compression strategies
• Entropy (anonymous data store), a computer network designed to be resistant to censorship
• Entropy (computing), an indicator of the number of random bits available to seed cryptography systems
• Entropy (package manager), a Sabayon Linux package manager
• Entropy in thermodynamics and information theory, exploring the relationship between thermodynamic & information entropy.

Mathematics

• 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

Other sciences and social sciences

• Entropy (anesthesiology), a measure of a patient's cortical function
• Entropy (ecology), a measure of biodiversity in the study of biological ecology
• Social entropy, a measure of the natural decay within a social system

Music

• Entropy (album), an album by Anathallo and Javelins
• Entropy (Hip Hop Reconstruction from the Ground up), a hip-hop suite by DJ Shadow and the Groove Robbers
• Entropy ry, a student organization for electronic music at Helsinki University of Technology
• "Entropy", a song by Bad Religion on Against the Grain
• "Entropy", a song by VNV Nation on Matter + Form
• "Entropy", a song by Moxy Früvous on The 'b' Album
• "Entropy", a song by MC Hawking

Modern culture

• Entropy (board game)
• "Entropy" (Buffy episode)
• Entropy (film), a 1999 film by Phil Joanou
• "Entropy", a 1960 short story by Thomas Pynchon
• Entropy: A New World View, a book by Jeremy Rifkin and Ted Howard

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