Question

definition for law of constant proportion

Answer 1

law of constant proportion - (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight. law of definite proportions. law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"

Answer 2

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.