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law of mass action - (chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances. 1  law of nature, law - a generalization that describes recurring facts or events in nature; the laws of thermodynamics.
Under this framework, it was believed that mass was an independent property unrelated to energy. That is, mass cannot be converted to energy, and vice-versa. And hence, we needed two laws, namely - the law of conservation of mass and the law of conservation of energy. Both dealt with the conservation of different quantities.