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The law of conservation of matter states that matter can be neither created nor destroyed during a chemical reaction. This means that all the atoms present before a reaction must be present after the reaction, and that the total mass of a system does not change as the result of a chemical reaction.
The conservation of mass is a fundamental concept of physics along with the conservation of energy and the conservation of momentum. Within some problem domain, the amount of mass remains constant--mass is neither created nor destroyed.