law of equivalent proportions

Noun
  1. (chemistry) law stating that the proportions in which two elements separately combine with a third element are also the proportions in which they combine together (synset 105890185)
    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
    same as: law of reciprocal proportions

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