law of definite composition

noun

Chemistry. the statement that in a pure compound the elements are always combined in fixed proportions by weight.
Logic. the law that either a proposition or its denial must be true.

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It will be observed that this fact does not contradict the law of definite composition, for entirely different substances are formed.

The atomic hypothesis and the law of definite composition.

This truth is known as the law of definite composition, and may be stated thus: The composition of a chemical compound never varies.

Iron sulphide, from whatever source, will have the same composition, which is in accordance with the law of definite composition.

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