What is the principle of constant proportions?

This is also called "The Forchhammer Principle" after Johan Georg Forchhammer Wikipedia says: "In 1865, Johan Georg Forchhammer conjectured that the ratio of major salts in samples of seawater from various locations was constant. read more

This constant ratio is known as Forchhammer's Principle, or the Principle of Constant Proportions. Forchhhammer's theory was proven correct in 1884 by Prof William Dittmar following extensive analysis of sea-water samples taken during the Challenger expedition.". read more

In chemistry, the law of definite proportions, 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 (by mass) and does not depend on its source and method of preparation. read more