Question

Who gave the Law of constant proportions?

Answer 1

Law of constant proportions

• The Law of constant proportion is given by chemist Joseph Proust.
• In this law, elements combine in simple ratios of natural numbers.
• "In a chemical substance, the elements are always present in definite proportions by mass”.

Example

In ammonia, nitrogen and hydrogen are always present in the ratio $14:3$by mass, whatever the method or the source from which it is obtained.