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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.
law of conservation of matter - a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system. conservation of mass, conservation of matter, law of conservation of mass. conservation - (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations.