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


  • 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


  • 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

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

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