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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.
The Law of Conservation of Mass is that, in a closed system, matter cannot be created or destroyed. It can change forms but is conserved. Law of Conservation of Mass in Chemistry. The Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants. Antoine Lavoisier stated, atoms of an object cannot be created or destroyed, but can be moved around and be changed into different particles.