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
See also
- Stability
- Steady state (disambiguation)
- Equilibristics, e.g. juggling
- Reflective equilibrium, the state of balance or coherence among a set of beliefs arrived at by a process of deliberative mutual adjustment
- Social equilibrium, a system in which there is a dynamic working balance among its interdependent parts
cs:Equilibrium
de:Gleichgewicht
es:Equilibrio
fr:Équilibre
io:Equilibro
id:Kesetimbangan
he:שיווי משקל
pt:Equilíbrio
ru:Равновесие
sl:Ravnovesje