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
References in periodicals archive ?
Without the atomic hypothesis the law of the additivity of masses and the law of definite proportions remain entirely independent of one another.
In 1789 Antoine Lavoisier formulated the law of conservation of mass, and in 1799 Joseph-Louis Proust stated the law of definite proportions, allowing chemists to distinguish between mixtures and compounds.
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.