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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 matter cannot be created nor destroyed, only it's form changed. Take the example of burning a piece of paper. It seems that the mass shrinks as the paper burns. However, what is really happening is that the paper is changing form to ash, carbon dioxide, and water vapor.