define law of constant proportion
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In chemistry, the law of definite proportion, sometimes called Proust's law or the law of definite composition, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation.
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The law of constant proportions states that when a compound is broken, the masses of the constituent elements remain in the same proportion. Or, in a chemical compound, the elements are always present in definite proportions by mass.
This means each compound has the same elements in the same proportions, regardless of where the compound was obtained, who prepared it, or its mass.
This law was formulated and proven by Joseph Louis Proust in 1799.
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