law of definite proportions


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Related to law of definite proportions: law of multiple proportions
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Noun1.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 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