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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 observed in a balanced chemical equation, which is a chemical equation that shows all mass is conserved throughout the reaction. Chemical equations that do not obey the law of conservation of mass are known as unbalanced equations, or skeleton equations.