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In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
Related to law of conservation of mass: law of conservation of matter. The principle that matter can neither be created nor be destroyed, now part of the first law of thermodynamics. See Note at thermodynamics.