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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.
CHANGES IN MATTER Mission Impossible! of scientists. To the Teacher: The law of conservation of mass indicates that mass cannot be created nor destroyed. means the total mass of reactants in a chemical reaction will equal the total mass of the products. mass because the students are unable to see the gas. may be used to collect the gas and preserve the mass.