Equilibrium is a state of equipoise; a state of rest produced by the mutual counteraction of two or more forces, as the state of the two ends of a lever or balance, when both are charged with equal weight. When a body, being slightly moved out of any position, always tends to return, to its position, that position is said to be one of stable equilibrium; when the body will not thus return to its previous position, its position is said to be one of unstable equilibrium.
In chemistry, equilibrium is a state existing in a reversible reaction when the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products are equal. Research Equilibrium
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