scientific law regarding conservation of a physical property
A conservation law is a scientific principle stating that certain physical properties—like energy, momentum, or mass—cannot be created or destroyed, only transformed from one form to another. These laws matter because they help us understand and predict how physical systems behave, and they form the foundation for nearly all of modern physics and engineering.
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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 mass-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.
A local conservation law is usually expressed mathematically as a continuity equation, a partial differential equation which gives a relation between the amount of the quantity and the "transport" of that quantity. It states that the amount of the conserved quantity at a point or within a volume can only change by the amount of the quantity which flows in or out of the volume.
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