Conservation law

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In pheesics, a conservation law states that a pairteecular measurable property o an isolatit pheesical seestem disna chynge as the seestem evolves ower time. Exact conservation laws include conservation o energy, conservation o linear momentum, conservation o angular momentum, an conservation o electric chairge. Thare are an aa mony approximate conservation laws, which apply tae such quantities as mass, parity, lepton nummer, baryon nummer, strangeness, hyperchairge, etc. Thir quantities are conserved in certain clesses o pheesics processes, but nae in aw.