Entropy
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Physical quantity
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Statistical mechanics
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State function
Entropy (disambiguation)
Entropy is a measure of disorder in a system.
Quantum mechanical entropy
Quantum mechanical entropy
Sackur–Tetrode equation
The Sackur–Tetrode equation is an expression for the entropy of a monatomic classical ideal gas which incorporates quantum considerations which give a more detailed description of its regime of validi...
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
Tsallis entropy
In physics, the Tsallis entropy is a generalization of the standard Boltzmann–Gibbs entropy. It was introduced in 1988 by Constantino Tsallis as a basis for generalizing the standard statistical mecha...
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
Bekenstein bound
In physics, the Bekenstein bound is an upper limit on the entropy S, or information I, that can be contained within a given finite region of space which has a finite amount of energy—or conversely, th...
Depletion force
A depletion force is an effective attractive force that arises between large colloidal particles that are suspended in a dilute solution of depletants, which are smaller solutes that are preferentiall...
Depletion force - Wikipedia
Ectropy
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. ...
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...
Homentropic flow
In fluid mechanics, a homentropic flow has uniform and constant entropy. It distinguishes itself from an isentropic or particle isentropic flow, where the entropy level of each fluid particle does not...
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
Residual entropy
Residual entropy is the difference in entropy between a non-equilibrium state and crystal state of a substance close to absolute zero. This term is used in condensed matter physics to describe the en...
Quantum statistical mechanics
Quantum statistical mechanics is statistical mechanics applied to quantum mechanical systems. In quantum mechanics a statistical ensemble (probability distribution over possible quantum states) is des...
Entropic explosion
An entropic explosion is an explosion in which the reactants undergo a large change in volume without releasing a large amount of heat. The chemical decomposition of triacetone triperoxide (TATP) is a...
Entropy of fusion
The entropy of fusion is the increase in entropy when melting a substance. This is almost always positive since the degree of disorder increases in the transition from an organized crystalline solid t...
List of thermodynamic properties
Specific properties are expressed on a per mass basis; in some circumstances other dimensions could be used, such as per-mole.Regarding Work and Heat:Note that work and heat above are listed as proces...
List of thermodynamic properties - Wikipedia
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
Entropic force
In physics, an entropic force acting in a system is a phenomenological force resulting from the entire system's statistical tendency to increase its entropy, rather than from a particular underlying m...
Entropic force - Wikipedia
Nucleate boiling
Nucleate boiling is a type of boiling that takes place when the surface temperature is hotter than the saturated fluid temperature by a certain amount but where the heat flux is below the critical hea...
Nucleate boiling - Wikipedia
Min entropy
The min entropy, in information theory, is the smallest of the Rényi family of entropies, corresponding to the most conservative way of measuring the unpredictability of a set of outcomes, as the nega...
H-theorem
In classical statistical mechanics, the H-theorem, introduced by Ludwig Boltzmann in 1872, describes the tendency to increase in the quantity H (defined below) in a nearly-ideal gas of molecules. As ...
Entropic uncertainty
In quantum mechanics, information theory, and Fourier analysis, the entropic uncertainty or Hirschman uncertainty is defined as the sum of the temporal and spectral Shannon entropies. It turns out th...
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 of mixing
In thermodynamics the entropy of mixing is the increase in the total entropy when several initially separate systems of different composition, each in a thermodynamic state of internal equilibrium, ar...
Classical thermodynamics
Thermodynamics is a branch of physics concerned with heat and temperature and their relation to energy and work. It defines macroscopic variables, such as internal energy, entropy, and pressure, that ...
Classical thermodynamics - Wikipedia
Standard molar entropy
In chemistry, the standard molar entropy is the entropy content of one mole of substance, under standard conditions (not standard temperature and pressure STP).The standard molar entropy is usually gi...
Entanglement distillation
Entanglement distillation is the transformation of N copies of an arbitrary entangled state into some number of approximately pure Bell pairs, using only local operations and classical communication ...
Entanglement distillation - Wikipedia
Strong Subadditivity of Quantum Entropy
Strong subadditivity of entropy (SSA) was long known and appreciated in classical probability theory andinformation theory.Its extension to quantum mechanical entropy (the von Neumann entropy) was co...
Conformational entropy
Conformational entropy is the entropy associated with the physical arrangement of a polymer chain that assumes a compact or globular state in solution. The concept is most commonly applied to biologic...
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 ...