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Definition of Proust, Joseph Louis in English: Proust, Joseph Louisproper nounpruːstpro͞ost (1754–1826), French analytical chemist. He proposed the law of constant proportions, demonstrating that any pure sample of a chemical compound (such as an oxide of a metal) always contains the same elements in fixed proportions.
Definition of Proust, Joseph Louis in US English: Proust, Joseph Louisproper nounpro͞ost (1754–1826), French analytical chemist. He proposed the law of constant proportions, demonstrating that any pure sample of a chemical compound (such as an oxide of a metal) always contains the same elements in fixed proportions.
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