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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 law of conservation of mass states that mass cannot be created nor destroyed. However, in modern physics, this is not true. It has been observed that energy can be convert â¦ ed to mass and mass to energy. So, now, the law has been changed to mass-energy cannot be created nor destroyed in modern physics. In chemistry,however, the former is true.