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.
Dalton based his theory on two laws: the law of conservation of mass and the law of constant composition. The law of conservation of mass says that matter is not created or destroyed in a closed system. That means if we have a chemical reaction, the amount of each element must be the same in the starting materials and the products. We use the law of conservation of mass every time we balance equations!