<P> 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 . There are also many approximate conservation laws , which apply to such quantities as mass , parity , lepton number , baryon number , strangeness , hypercharge , etc . These quantities are conserved in certain classes of physics processes , but not in all . </P>
<P> 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 . There are also many approximate conservation laws , which apply to such quantities as mass , parity , lepton number , baryon number , strangeness , hypercharge , etc . These quantities are conserved in certain classes of physics processes , but not in all . </P>
what is the meaning of conservation in physics
what is the meaning of conservation in physics
a particular measurable property of an isolated physical system does not change as the system evolves over time
a particular measurable property of an isolated physical system does not change as the system evolves over time