Science
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Physics
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Energy
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Philosophy of physics
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Thermodynamics
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Dynamical system
Concept
Physical quantity
Heat
Fundamental physics concepts
Statistical mechanics
Philosophy of thermal and statistical physics
Concepts in physics
Dynamical systems
Thermodynamic properties
State function
Spacetime singularity
Gravitational singularity
Entropy
In thermodynamics, entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, commonly understood as a measure of disorder. According to the ...
Entropy - Wikipedia
History of entropy
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Introduction to entropy
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Entropy (classical thermodynamics)
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Entropy (statistical thermodynamics)
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Entropy (energy dispersal)
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Entropy (information theory)
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Entropy (order and disorder)
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Arrow of time
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Entropy and life
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Negentropy
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Von Neumann entropy
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Heat death of the universe
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Gibbs paradox
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Entropy and information
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Quantum mechanical entropy
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Entropy (disambiguation)
We May Have Found a Way to Cheat the Second Law of Thermodynamics
Physicists created a new quantum theorem for entropy, and included is a possible exception.
Entropy - Wikipedia
How Funny Is This Word? The 'Snunkoople' Effect
How do you quantify something as complex and personal as humour? University of Alberta researchers have developed a mathematical method of doing just that—and it might not be quite as personal as we t...
Nanoparticles found to violate second law of thermodynamics
It may be a little late for April Fool’s, but some skepticism is nonetheless warranted when reading that researchers have shown nanoparticles to disobey a fundamental law of physics which dictates the...
Entropy Intuition
A discussion of what entropy is and what it isn't. More free lessons at: http://www.khanacademy.org/video?v=xJf6pHqLzs0
The Discovery of Entropy
Adam Schulman discusses "The Discovery of Entropy" and its implications for our understanding and the relationship between philosophy and science. Adam Schul...
Proof: S (or Entropy) is a valid state variable
Prroof that S (or entropy) is a valid state variable. More free lessons at: http://www.khanacademy.org/video?v=sPz5RrFus1Q
Thermodynamic Entropy Definition Clarification
Clarifying that the thermodynamic definition of Entropy requires a reversible system. More free lessons at: http://www.khanacademy.org/video?v=PFcGiMLwjeY
Entropy and the Second Law of Thermodynamics
Deriving the concept of entropy; showing why it never decreases and the conditions for spontaneous actions. Why does heat go from hot to cold and not the oth...
More on Entropy
More clarification as to what entropy is and what entropy is not. More free lessons at: http://www.khanacademy.org/video?v=dFFzAP2OZ3E
Reconciling Thermodynamic and State Definitions of Entropy
Long video explaining why entropy is a measure of the number of states a system can take on (mathy, but mind-blowing). More free lessons at: http://www.khana...
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 ...
History of entropy - Wikipedia
Introduction to entropy
The idea of "irreversibility" is central to the understanding of entropy. Everyone has an intuitive understanding of irreversibility (a dissipative process) - if one watches a movie of everyday life r...
Introduction to entropy - Wikipedia
Entropy (classical thermodynamics)
Entropy is a property of thermodynamical systems invented by Rudolf Clausius who named it from the Greek word τρoπή, "transformation". Later Ludwig Boltzmann described the entropy as a measure of the ...
Entropy (classical thermodynamics) - Wikipedia
Entropy (statistical thermodynamics)
In classical statistical mechanics, the entropy function earlier introduced by Clausius is interpreted as statistical entropy using probability theory. The statistical entropy perspective was introdu...
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 a...
Entropy (information theory)
In information theory, entropy is the average amount of information contained in each message received. Here, message stands for an event, sample or character drawn from a distribution or data stream....
Entropy (information theory) - Wikipedia
Entropy (order and disorder)
In thermodynamics, entropy is commonly associated with the amount of order, disorder, or chaos in a thermodynamic system. This stems from Rudolf Clausius' 1862 assertion that any thermodynamic proce...
Entropy (order and disorder) - Wikipedia
Arrow of time
The Arrow of Time, or Time's Arrow, is a concept developed in 1927 by the British astronomer Arthur Eddington involving the "one-way direction" or "asymmetry" of time. This direction, which can be det...
Arrow of time - Wikipedia
Entropy and life
Research concerning the relationship between the thermodynamic quantity entropy and the evolution of life began around the turn of the 20th century. In 1910, American historian Henry Adams printed an...
Negentropy
The negentropy, also negative entropy or syntropy or extropy or entaxy, of a living system is the entropy that it exports to keep its own entropy low; it lies at the intersection of entropy and life. ...
Negentropy - Wikipedia
Von Neumann entropy
In quantum statistical mechanics, the von Neumann entropy, named after John von Neumann, is the extension of classical Gibbs entropy concepts to the field of quantum mechanics. For a quantum-mechanica...
Heat death of the universe
The heat death of the Universe is a historically suggested ultimate fate of the universe in which the Universe has diminished to a state of no thermodynamic free energy and therefore can no longer sus...
Heat death of the universe - Wikipedia
Gibbs paradox
In statistical mechanics, a semi-classical derivation of the entropy that does not take into account the indistinguishability of particles, yields an expression for the entropy which is not extensive ...
Gibbs paradox - Wikipedia
Entropy and information
Quantum mechanical entropy
Entropy (disambiguation)
Entropy is a measure of disorder in a system.
We May Have Found a Way to Cheat the Second Law of Thermodynamics
Physicists created a new quantum theorem for entropy, and included is a possible exception.
Measure-preserving dynamical system
In mathematics, a measure-preserving dynamical system is an object of study in the abstract formulation of dynamical systems, and ergodic theory in particular.
A measure-preserving dynamical syste...
Measure-preserving dynamical system - Wikipedia
Holographic principle
The holographic principle is a property of string theories and a supposed property of quantum gravity that states that the description of a volume of space can be thought of as encoded on a boundary ...