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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.
law of conservation of energy-the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes. conservation of energy, first law of thermodynamics. law of thermodynamics - (physics) a law governing the relations between states of energy in a closed system.