Diwali is the five-day festival of lights, celebrated by millions of Hindus, Sikhs and Jains across the world. The festival, which coincides with the Hindu New Year, celebrates new beginnings and the triumph of good over evil and light over darkness.
The law of definite proportions, also known law of definite composition, states that regardless of the amount, a pure compound always contains the same elements in the same proportions by mass.
The generalization of this idea is the law of multiple proportions: When two elements form a series of compounds, the masses of one that combine with a fixed mass of the other are in the ratio of (small) integers to each other. This law is obeyed by all gaseous compounds, which is what Dalton studied.