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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.
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. Related to conservation of matter: law of conservation of matter. (in physics) a law stating that matter can be neither created nor destroyed and that the amount of matter in the universe is finite. It is superseded by the special relativity equation e = mc2, but it is still applicable in the chemical process. Also called conservation of mass. See also conservation of energy.