Entropy (disambiguation)

Entropy can have several meanings:

Additional recommended knowledge

Recognize and detect the effects of electrostatic charges on your balance

What is the Sensitivity of my Balance?

How to ensure accurate weighing results every day?

Science and technology

• Thermodynamic entropy, the thermodynamic homogeneity of a system, limiting the ability to extract mechanical work

• Entropy (classical thermodynamics), macroscopic understanding of thermodynamic entropy
• Entropy (statistical thermodynamics), microscopic understanding of thermodynamic entropy
• Gibbs entropy, statistical entropy of a thermodynamic system
• von Neumann entropy, entropy of a quantum-mechanical system
• Boltzmann entropy formula, S = k ln W

• Information entropy, in statistics, the amount of information that is lacking in a random variable

• Entropy encoding, data compression strategies that set out to achieve message lengths close to the Shannon entropy
• Entropy (ecology), use of Shannon entropy as a measure of biodiversity in the study of ecology
• Renyi entropies, family of diversity measures generalising Shannon entropy; used to define fractal dimensions

Mathematics

• 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

Media

• Entropy (magazine) the magazine of the Students Association of the University of South Australia

Medicine

• Entropy (monitor) a monitor of anaesthetic depth using analysis of a 2 lead EEG

Computing

• Entropy (anonymous data store), a computer network designed to be resistant to censorship
• Entropy (PHP), a version of PHP compiled for Mac OS X
• Entropy (computing), an indicator of the number of random bits available to seed cryptography systems

Literature

• Entropy (board game), the name of two board games
• a short story by Thomas Pynchon

Film

• Entropy (film), a 1999 film directed by Phil Joanou.
• Entropy (2006 film), an independent film shot in South-Eastern Wisconsin.

Music and television

• Entropy (album), a split vinyl album by Anathallo and Javelins
• Entropy ry., a student organization for electronic music at Helsinki University of Technology
• a song on the album Against the Grain by Bad Religion
• a song on the album Matter + Form by VNV Nation
• a song on the b album by Moxy Früvous
• a song by MC Hawking
• Entropy (Hip Hop Reconstruction from the Ground up), Hip-Hop Suite by DJ Shadow and the Groove Robbers
• "Entropy" (Buffy episode), an episode of the TV series Buffy the Vampire Slayer