law of definite proportions

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Related to Proust's law: law of definite proportion

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Noun

law of definite proportions - (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight

law of constant proportion

law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"

chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

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He went on to make a similar case for a number of other compounds and maintained that there was a general law of definite proportions, often called Proust's law.

Law of definite proportions

In 1803 an English chemist, John Dalton (1766-1844), advanced a summary of atomic thinking, backing it up with the evidence that had accumulated, including particularly Proust's law of definite proportions and his own investigations of the way in which gases behaved.