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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.
Dictionary entry overview: What does law of conservation of mass mean? â¢ LAW OF CONSERVATION OF MASS (noun) The noun LAW OF CONSERVATION OF MASS has 1 sense: 1. a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system Familiarity information: LAW OF CONSERVATION OF MASS used as a noun is very rare.