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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.
It means that the total amount of mass (or energy) won't change. The Law of Conservation of Energy states: Energy cannot be created or destroyed but merely change from one foâ¦rm to another. Einstein showed that matter is a form of energy. When a nuclear decay occurs there is a minuscule loss of mass that is transformed into energy.