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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.
Heat, Energy, and Chemical Bonds. Introduction. In Chapter 11 we saw two examples of principles of conservation, involving matter and charge, in chemical reactions. Neither the total mass nor the net oxidation number of reactants and products can change during a chemical transformation. Mass and oxidation number are more fundamental properties of substances than are volume, color, texture, density, or electrical conductivity. A third important property that is conserved is energy.