Ammonia (NH3) obtained from different sources always has same proportion of Nitrogen and Hydrogen. It proves the validity of law of:

The observation that ammonia (NH3) obtained from different sources always contains the same proportion of nitrogen and hydrogen by mass validates the Law of Constant Proportion, also known as the Law of Definite Proportions. Formulated by Joseph Proust in 1799, this law states that a pure chemical compound always consists of the same elements combined together in a fixed or definite proportion by weight, regardless of its source or method of preparation. Specifically, ammonia will always contain nitrogen and hydrogen in a fixed mass ratio (approximately 14:3). This differs from the Law of Multiple Proportions, which applies when two elements form more than one compound, and the Law of Reciprocal Proportions, which involves three elements. Therefore, the consistency of ammonia's composition across various sources is a direct application of Proust's law.