The Law of Constant Proportions, also known as the Law of Definite Proportions, was stated by Joseph Proust. It asserts that in a chemical substance, the elements are always present in definite proportions by mass.
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The Law of Constant Proportions, proposed by Joseph Proust, states that in a chemical compound, the elements are always combined in fixed proportions by mass regardless of the compound’s source or how it was prepared.