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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 materials to the right of the arrow are the products, or materials that have been produced by the reaction. The Law of Conservation of Mass states that in a chemical reaction no mass is lost or gained. The Law of Conservation of Mass applies to individual types of atom. One could say that for any element, there is no loss or gain of that element in a chemical reaction. There are such things as reversible reactions, reactions in which the products reassemble to become the original products.