Question

Who gave the Law of constant proportions?

Answer 1

Law of Constant composition:

• The French chemist Joseph Proust gave this law in $1794$.
• This law means that each chemical compound, regardless of its origin, will always consist of the elements in the same ratio by mass.
• “Chemical compounds are made up of components existing in a fixed mass ratio, according to the law of constant proportions.”
• The Law of constant proportions is also known as the Law of Definite Proportions.