law of mass action

Noun
  1. (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 (synset 105891144)
    referred to in: chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
    is a type of: law, law of nature - a generalization that describes recurring facts or events in nature

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