Law of definite proportions.
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Law of definite proportions
chemistry
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Alternative Titles: Proust’s law, law of constant composition
Law of definite proportions, statement that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements. Although many experimenters had long assumed the truth of the principle in general, the French chemist Joseph-Louis Proust first accumulated conclusive evidence for it in a series of researches on the composition of many substances, especially the oxides of iron (1797).
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