Le Chatelier principal

A principle stating that if a constraint (such as a change in pressure, temperature, orconcentration of a reactant) is applied to a system in equilibrium, the equilibrium will shiftso as to tend to counteract the effect of the constraint.

Le Chatelier′s Principle is the principle when a stress is applied to a chemical system at equilibrium, the equilibrium will shift to relieve the stress. The principle is used to manipulate the outcomes of reversible reactions, often to increase the yield of reactions.

In pharmacology, the binding of ligands to the receptor may shift the equilibrium according to Le Châtelier's principle, thereby explaining the diverse phenomena of receptor activation and desensitization.

In economics, the principle has been generalized to help explain the price equilibrium of efficient economic systems. In simultaneous equilibrium systems, phenomena that are in apparent contradiction to Le Châtelier's principle can occur; these can be resolved by the theory of response reactions.