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Le chatlier's principle is defined as "when a stress is applied to a dynamic equilibrium, the equilibrium tends to adjust to minimize the effect of stress". This means for example that when a reactant is added, more product forms to maintain equilibrium. If reactant is removed, more reactant is formed from the products again to maintain equilibrium.
Also, an applied stress can be caused by changes to the environment, such as compression or temperature. As a result, the reaction will favor the side (either reactants or products) that will reduce the stress caused by that change. For example, if a container is compressed, the reaction occurring within it will shift to the side that will reduce the pressure, i.e. the side with less gas-phase molecules.
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