Equilibrium (disambiguation)

Equilibrium is the condition of a system in which competing influences are balanced; it may refer to:

Biology

 * Equilibrioception, the sense of balance present in humans and animals
 * Homeostasis, the property of an open system, especially living organisms, to regulate its internal environment
 * Genetic equilibrium, theoretical state in which a population is not evolving
 * Punctuated equilibrium, theory in evolutionary biology
 * Sedimentation equilibrium, analytical ultracentrifugation method for measuring protein molecular masses in solution
 * Ecological homeostasis, a property of some ecosystems

Chemistry

 * Chemical equilibrium, the state in which the concentrations of the reactants and products have no net change over time
 * Diffusion equilibrium, 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, the state in which two reversible processes occur at the same rate
 * Equilibrium constant, a quantity characterizing a chemical equilibrium in a chemical reaction
 * Equilibrium unfolding, the process of unfolding a protein or RNA molecule by gradually changing its environment
 * Partition equilibrium, a type of chromatography that is typically used in GC
 * Quasistatic equilibrium, the quasi-balanced state of a thermodynamic system near to equilibrium in some sense or degree
 * Thermodynamic equilibrium, the state of a thermodynamic system which is in thermal, mechanical, and chemical equilibrium

Game theory

 * Correlated equilibrium, a solution concept in game theory that is more general than the well known Nash equilibrium
 * Nash equilibrium, a kind of solution concept of a game in game theory involving two or more players
 * Quasi-perfect equilibrium, a refinement of Nash Equilibrium for extensive form games due to Eric van Damme
 * Sequential equilibrium, a refinement of Nash Equilibrium for extensive form games due to David M. Kreps and Robert Wilson
 * Symmetric equilibrium, in game theory where both players use the same strategy in the equilibrium
 * Trembling hand perfect equilibrium assumes that the players, through a "slip of the hand" or tremble, may choose unintended strategies