law of definite proportions definition

  • adjective:
    • the fundamental law of substance combination that every definite element constantly provides the exact same elements in identical proportions by body weight; and, if several elements form more than one mixture with each other, the relative proportions of every are fixed. Compare Law of multiple proportions, under several.
  • noun:
    • (chemistry) legislation saying that every pure material constantly provides the exact same elements combined in the same proportions by weight
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