Equilibrium

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Mathematics

• The stationary point
  Stationary point
  
  In mathematics, particularly in calculus, a stationary point is an input to a function where the derivative is zero : where the function "stops" increasing or decreasing ....
   of a dynamical system
  Dynamical system
  
  The dynamical system concept is a mathematics formalization for any fixed "rule" which describes the time dependence of a point's position in its ambient space....
   is often called an equilibrium.

Science

Biology

• Equilibrioception
  Equilibrioception
  
  Equilibrioception or sense of balance is one of the physiology senses. It helps prevent humans and animals from falling over when walking or standing still....
  , the sense of balance present in humans and animals
• Genetic equilibrium
  Genetic equilibrium
  
  A genetic equilibrium occurs when an allele within a gene pool is not changing in frequency . For this to be the case, evolutionary forces acting upon the allele must be equal and opposite....
  , theoretical state in which a population is not evolving
• Homeostasis
  Homeostasis
  
  Homeostasis is the property of a system, either open system or closed system, that regulates its internal environment and tends to maintain a stable, constant condition....
  , the ability of an open system, especially living organisms, to regulate its internal environment
• Punctuated equilibrium
  Punctuated equilibrium
  
  Punctuated equilibrium is a theory in Evolution which states that most Sexual reproduction species experience little change for most of their geological history, and that when phenotypic evolution does occur, it is localized in rare, rapid events of branching speciation ....
  , theory in evolutionary biology
• Sedimentation equilibrium
  Sedimentation equilibrium
  
  Sedimentation equilibrium in a solution or suspension of different particles, such as molecules, exists when the rate of transport of each material in any one direction due to sedimentation equals the rate of transport in the opposite direction due to diffusion....
  , analytical ultracentrifugation method for measuring protein molecular masses in solution

Physics

• Equilibrium figures of Earth and planets (Physical geodesy
  Physical geodesy
  
  Physical geodesy is the study of the physical properties of the gravity field of the Earth, the geopotential, with a view to their application in geodesy....
  )
• Equilibrium mode distribution
  Equilibrium mode distribution
  
  The equilibrium mode [power] distribution of light travelling in an optical waveguide or optical fiber, is the distribution of light that is no longer changing with fibre length or with input modal excitation....
  , involves light traveling in an optical waveguide or fiber
• Hydrostatic equilibrium
  Hydrostatic equilibrium
  
  Hydrostatic equilibrium occurs when compression due to gravity is balanced by a pressure gradient which creates a pressure gradient force in the opposite direction....
  , the state of a system in which compression due to gravity is balanced by a pressure gradient force
• Hyperbolic equilibrium point
  Hyperbolic equilibrium point
  
  In mathematics, especially in the study of dynamical system, a hyperbolic equilibrium point or hyperbolic fixed point is a special type of fixed point ....
  , a mathematical concept in physics
• Mechanical equilibrium
  Mechanical equilibrium
  
  A standard definition of is:This is a strict definition, and often the term "static equilibrium" is used in a more relaxed manner interchangeably with "mechanical equilibrium", as defined next....
  , the state in which the sum of the forces, and torque, on each particle of the system is zero
• Secular equilibrium
  Secular equilibrium
  
  In nuclear physics, secular equilibrium is a situation in which the quantity of a radioactive isotope remains constant because its production rate is equal to its decay rate....
  , a state of radioactive elements in which the production rate of a daughter nucleus is balanced by its own decay rate

Chemistry

• Chemical equilibrium
  Chemical equilibrium
  
  In a chemical process, chemical equilibrium is the state in which the Activity or concentrations of the reactants and products have no net change over time....
  , the state in which the concentrations of the reactants and products have no net change over time
• Diffusion equilibrium
  Diffusion equilibrium
  
  Diffusion equilibrium is reached when the concentrations of the Diffusion in the two compartments becomes equal.Consider two systems; S1 and S2 at the same temperature and capable of exchanging Molecule....
  , when the concentrations of the diffusing substance in the two compartments are equal
• Donnan equilibrium, the distribution of ion species between two ionic solutions separated by a semipermeable membrane or boundary
• Dynamic equilibrium
  Dynamic equilibrium
  
  A system in dynamic equilibrium is a particular example of a system in a steady state. In a steady state the rate of inputs is equal to the rate of outputs so that the composition of the system is unchanging in time....
  , the state in which two reversible processes occur at the same rate
• Equilibrium constant
  Equilibrium constant
  
  For a general chemical equilibriumthe equilibrium constant can be defined bywhere is the activity of the chemical species A etc . It is conventional to put the activities of the products in the numerator and those of the reactants in the denominator....
  , a quantity characterizing a chemical equilibrium in a chemical reaction
• Equilibrium unfolding
  Equilibrium unfolding
  
  In biochemistry, equilibrium unfolding is the process of protein folding by gradually changing its solution conditions, i.e., its environment. Since equilibrium is maintained at all steps, the process is reversible ....
  , the process of unfolding a protein or RNA molecule by gradually changing its environment
• Psychrometrics
  Psychrometrics
  
  Psychrometrics or psychrometry are terms used to describe the field of engineering concerned with the determination of physical and thermodynamic properties of gas-vapor mixtures....
    (Humidification/ Dehumidification Drying
  Drying
  
  Drying is a mass transfer process resulting in the removal of water moisture or moisture from another solvent, by evaporation from a solid, semi-solid or liquid to end in a solid state....
  )
• Partition equilibrium
  Partition equilibrium
  
  The most common chemical equilibrium systems involve reactants and products in the same phase - either all gases or all solutions. However, it is also possible to get equilibria between substances in different phases, such as two liquids that do not mix ....
  , a type of chromatography that is typically used in GC
• Quasistatic equilibrium
  Quasistatic equilibrium
  
  Quasistatic equilibrium is the quasi-balanced state of a thermodynamic system near to thermodynamic equilibrium in some sense or degree. A process is called quasistatic process when it follows a succession of equilibrium states; the surroundings may be irreversibly altered during the process so that after a return path, the system ends up i...
  , the quasi-balanced state of a thermodynamic system near to equilibrium in some sense or degree
• Schlenk equilibrium
  Schlenk equilibrium
  
  The Schlenk equilibrium is a chemical equilibrium named after its discoverer Wilhelm Schlenk taking place in solutions of Grignard reagents.The process described is an equilibrium between two equivalents of an alkyl or aryl magnesium halide on the left of the equation and on the right side, one equivalent of the dialkyl or diaryl magnesium...
  , a chemical equilibrium named after its discoverer Wilhelm Schlenk taking place in solutions of Grignard reagents
• Solubility equilibrium
  Solubility equilibrium
  
  Solubility equilibrium is any type chemical equilibrium between solid and dissolved states of a compound at saturation .Solubility equilibria involve application of chemical principles and constants to predict solubility of substances under specific conditions ....
  , any chemical equilibrium between solid and dissolved states of a compound at saturation
• Thermodynamic equilibrium
  Thermodynamic equilibrium
  
  In thermodynamics, a thermodynamics#Thermodynamic system is said to be in thermodynamic equilibrium when it is in thermal equilibrium, mechanical equilibrium, and chemical equilibrium....
  , the state of a thermodynamic system which is in thermal, mechanical, and chemical equilibrium
• Vapor-liquid equilibrium
  Vapor-liquid equilibrium
  
  Vapor-liquid equilibrium, abbreviated as VLE by some, is a condition where a liquid and its vapor are in Chemical equilibrium with each other, a condition or state where the rate of evaporation equals the rate of condensation on a molecular level such that there is no net vapor-liquid interconversion....
    Distillation
  Distillation
  
  Distillation is a method of separation process mixtures based on differences in their Volatility in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction....
  

Economics

• Competitive equilibrium
  Competitive equilibrium
  
  Competitive market equilibrium is the traditional concept of economic equilibrium, appropriate for the analysis of commodity markets with flexible prices and many traders, and serving as the benchmark of efficiency in economic analysis....
  , economic equilibrium when all buyers and sellers are small relative to the market
• Economic equilibrium
  Economic equilibrium
  
  In economics, economic equilibrium is simply a state of the world where economic forces are balanced and in the absence of external influences the values of economic variables will not change....
  , a condition in economics
• Equilibrium price, the price at which supply equals demand
• General equilibrium
  General equilibrium
  
  General equilibrium theory is a branch of theoretical economics. It seeks to explain the behavior of supply, demand and prices in a whole economy with several or many markets....
  , a branch of theoretical microeconomics
• Intertemporal equilibrium
  Intertemporal equilibrium
  
  Intertemporal equilibrium is a notion of economic equilibrium conceived over many periods of time. The term has a different meaning in contemporary macroeconomics from its earlier meaning in Austrian economics....
  , an equilibrium concept over time
• Lindahl equilibrium
  Lindahl equilibrium
  
  Economic equilibrium under a Lindahl tax describes the situation in which individuals pay for the provision of a public good according to their marginal benefits....
  , a method proposed by Erik Lindahl for financing public goods
• Partial equilibrium
  Partial equilibrium
  
  A partial equilibrium is a type of economic equilibrium, where the clearance on the market of some specific goods is obtained independently from prices and quantities demanded and supplied in other markets....
  , one part of the general economic equilibrium
• Radner equilibrium
  Radner equilibrium
  
  Radner equilibrium is an economic concept defined by economist Roy Radner in the context of general equilibrium. The concept is an extension of the Arrow-Debreu equilibrium and the base for the first consistent incomplete markets framework....
  , an economic concept defined by economist Roy Radner in the context of general equilibrium
• Recursive competitive equilibrium
  Recursive competitive equilibrium
  
  In macroeconomics, recursive competitive equilibrium is an Economic equilibrium . It has been widely used in exploring a wide variety of economic issues including business-cycle fluctuations, monetary and fiscal policy, trade related phenomena, and regularities in asset price co-movements....
  , an economic equilibrium concept associated with a dynamic program
• Static equilibrium (economics), the intersection of supply and demand in any market
• Sunspot equilibrium, an economic equilibrium in which nonfundamental factors affect prices or quantities
• Underemployment equilibrium
  Underemployment equilibrium
  
  In Keynesian economics, underemployment equilibrium refers to a situation with a persistent shortfall relative to full employment and potential output so that unemployment is higher than at the NAIRU or the natural rate of unemployment....
  , a situation in Keynesian economics with a persistent shortfall relative to full employment and potential output

Game theory

• Correlated equilibrium
  Correlated equilibrium
  
  In game theory, a correlated equilibrium is a solution concept that is more general than the well known Nash equilibrium. It was first discussed by mathematician Robert Aumann ....
  , a solution concept in game theory that is more general than the well-known Nash equilibrium
• Nash equilibrium
  Nash equilibrium
  
  In game theory, Nash equilibrium is a solution concept of a game involving two or more players, in which each player is assumed to know the equilibrium strategies of the other players, and no player has anything to gain by changing only his or her own strategy unilaterally....
  , a solution concept in game theory involving two or more players
• Quasi-perfect equilibrium
  Quasi-perfect equilibrium
  
  Quasi-perfect equilibrium is a refinement of Nash Equilibrium for extensive form games due to Eric van Damme. Informally, a player playing by a strategy from a quasi-perfect equilibrium takes observed as well as potential future mistakes of his opponents into account but assumes that he himself will not make a mistake in the future, even if h...
  , a refinement of Nash Equilibrium for extensive form games due to Eric van Damme
• Sequential equilibrium
  Sequential equilibrium
  
  Sequential equilibrium is a refinement of Nash Equilibrium for extensive form games due to David M. Kreps and Robert B. Wilson. A sequential equilibrium specifies not only a strategy for each...
  , a refinement of Nash Equilibrium for extensive form games due to David M. Kreps and Robert Wilson
• Symmetric equilibrium
  Symmetric equilibrium
  
  In game theory, a symmetric equilibrium is an equilibrium where both players use the same strategy in the equilibrium. In the Prisoner's Dilemma game pictured to the right, the only Nash equilibrium is ....
  , in game theory, an equilibrium where all players use the same strategy
• Trembling hand perfect equilibrium
  Trembling hand perfect equilibrium
  
  Trembling hand perfect equilibrium is a refinement of Nash Equilibrium due to Reinhard Selten. A trembling hand perfect equilibrium is an equilibrium that takes the possibility of off-the-equilibrium play into account by assuming...
   assumes that the players, through a "slip of the hand" or tremble, may choose unintended strategies
• Proper equilibrium
  Proper equilibrium
  
  Proper equilibrium is a refinement of Nash Equilibrium due to Roger B. Myerson.Proper equilibrium further refines Reinhard Selten's notion of a...
   due to Roger B. Myerson, where costly trembles are made with smaller probabilities

Music

• IX Equilibrium
  IX Equilibrium
  
  IX Equilibrium is the third studio album by the black metal band Emperor . The band had stated that they were to "return to their roots", and the music presented showcases some of the band's darkest and most vicious material, as well as their cleanest production at the time....
  , the third LP by the black metal band Emperor
• Equilibrium
  Equilibrium (Erik Mongrain album)
  
  Equilibrium is the second album of the Canada guitarist Erik Mongrain....
  , an album by Erik Mongrain
  Erik Mongrain
  
  Erik Mongrain is a Canadian composer and guitarist. He uses a unique acoustic style including a two-handed lap tapping technique on the acoustic guitar....
  
• Equilibrium
  Equilibrium (album)
  
  "Equilibrium" is the sixth studio album released by Crowbar on 7 March, 2000....
  , an album by sludge doom band Crowbar
• Equilibrium (band)
  Equilibrium (band)
  
  Equilibrium is a folk metal band from Germany. The band contains various elements of folk metal and symphonic black metal, combining instruments such as electric guitars, strings and flutes, as well as riffs which reflect traditional Germanic melodies....
  , a German Viking metal band
• Equilibrium (record label), a Portuguese record label
• Equilibrium, an album by Rome, Italy quintet 'The Gaia Corporation'
• Make Love and War, The Wedlock of Equilibrium, an album by Ordo Rosarius Equilibrio
  Ordo Rosarius Equilibrio
  
  Ordo Rosarius Equilibrio is a neofolk and martial industrial music group from Stockholm.The band is composed of its founding member and vocalist Tomas Pettersson, and Rose-Marie Larsen, who replaced Chelsea Krook on backup vocals....
  

Other

• Equilibrium (company)
• Equilibrium (2002 film)
  Equilibrium (film)
  
  Equilibrium, released in 2002, is a science fiction film/ Action movie film written and directed by Kurt Wimmer.Christian Bale portrays the film's main character ....
  , a science-fiction film
• "Equilibrium" (seaQuest 2032 episode)
  Equilibrium (seaQuest 2032 episode)
  
  "Equilibrium" was the seventh aired episode of seaQuest 2032`s third season and eighth produced overall. It was originally shown on November 15, 1995....
  , episode of seaQuest 2032
• "Equilibrium" (DS9 episode)
  Equilibrium (DS9 episode)
  
  "Equilibrium" is an episode Star Trek: Deep Space Nine, the fourth episode of the third season....
  , an episode of Star Trek: Deep Space Nine
• Equilibrium moisture content
  Equilibrium moisture content
  
  The moisture content of wood below the fibre saturation point is a function of both relative humidity and temperature of surrounding air. The equilibrium moisture content is the moisture content at which the wood is neither gaining nor losing moisture; this however, is a dynamic equilibrium and changes with relative humidity and temperature....
  , the moisture content at which the wood is neither gaining nor losing moisture
• Equilibrium point
  Equilibrium point
  
  In mathematics, the point is an equilibrium point for the differential equationif for all .Similarly, the point is an equilibrium point for the difference equation...
  , node in mathematics
• Equilibrium (puzzle)
  Equilibrium (puzzle)
  
  Equilibrium, also known as "Equi-librium" is an interlocking puzzle in the shape of a sphere. Copyrighted in 1974 by Reiss Games, Inc., it consists of 6 closed arch pieces, 5 of which have pegs on their straight center....
  , a 3D interlocking type puzzle made of 6 half circle pieces
• Patterson equilibrium, a theory used in highway traffic modelling, air-traffic modelling, business modelling, and electrical grid operation
• Reflective equilibrium
  Reflective equilibrium
  
  Reflective equilibrium is a state of balance or coherence among a set of beliefs arrived at by a process of deliberative mutual adjustment among general principles and particular judgments....
  , the state of balance or coherence among a set of beliefs arrived at by a process of deliberative mutual adjustment
• Social equilibrium
  Social equilibrium
  
  In sociology, a system is said to be social equilibrium when there is a dynamic working balance among its interdependent parts . Each subsystem will adjust to any change in the other subsystems and will continue to do so until an equilibrium is retained....
  , a system in which there is a dynamic working balance among its interdependent parts
• Equilibration is the means of cognitive development in Jean Piaget
  Jean Piaget
  
  Jean Piaget was a Switzerland philosophy and natural science,well known for his work studying children, his theory of cognitive development and for his epistemological view called "genetic epistemology."...
  's cognitive developmental theory.

See also

• Balance
  Balance
  
  Balance may refer to:...
  
• Equilibristics
  Equilibristics
  
  Equilibristics refers to a number of 'circus arts' and juggling skills characterised by balancing or maintaining a moving Mechanical equilibrium or balance of opposing forces....
  , e.g. juggling
• Stability
  Stability
  
  Stability may refer to:...
  
• Steady state (disambiguation)
  Steady state (disambiguation)
  
  Steady state in general is a dynamic equilibrium commonly observed in dynamic systems. Specifically, it may refer to:*Steady state , a central term in osmosis...