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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.
For sustainable energy resources, see Energy conservation. In physics, the law of conservation of energy states that the total energy of an isolated system remains constantâit is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another. For instance, chemical energy can be converted to kinetic energy in the explosion of a stick of dynamite. A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist.