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The law of conservation of matter states that matter can neither be created nor destroyed. If an environmental process is observed carefully it is able to account for the matter at any point in time. It does not mean that the form of the matter does not change, nor for that matter the properties of the matter.
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!