In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves. Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. In Physics the word system has a technical meaning namely it is the portion of the physical Universe chosen for analysis Any particular conservation law is a mathematical identity to certain symmetry of a physical system. Mathematics is the body of Knowledge and Academic discipline that studies such concepts as Quantity, Structure, Space and Symmetry generally conveys two primary meanings The first is an imprecise sense of harmonious or aesthetically-pleasing proportionality and balance such that it reflects beauty or A partial listing of conservation laws that are said to be exact laws, or more precisely have never been shown to be violated:

• Conservation of energy
• Conservation of linear momentum
• Conservation of angular momentum
• Conservation of electric charge
• Conservation of color charge
• Conservation of weak isospin
• Conservation of probability

There are also approximate conservation laws. In Physics, the law of conservation of energy states that the total amount of Energy in an isolated system remains constant and cannot be created although it may In Classical mechanics, momentum ( pl momenta SI unit kg · m/s, or equivalently N · s) is the product In Physics, the angular momentum of a particle about an origin is a vector quantity equal to the mass of the particle multiplied by the Cross product of the position Electric charge is a fundamental conserved property of some Subatomic particles which determines their Electromagnetic interaction. In Particle physics, color charge is a property of Quarks and Gluons which are related to their Strong interactions in the context of Quantum The weak isospin in Particle physics is a quantum number relating to the Weak interaction, and parallels the idea of Isospin under the Strong A continuity equation is a Differential equation that describes the conservative transport of some kind of quantity These are approximately true in particular situations, such as low speeds, short time scales, or certain interactions.

• Conservation of mass (applies for low speeds)
• Conservation of baryon number (See chiral anomaly)
• Conservation of lepton number (In the Standard Model)
• Conservation of flavor (violated by the weak interaction)
• Conservation of parity
• CP symmetry

See also

• Continuity equation
• Philosophy of physics
• Noether's theorem

References

• Stenger, Victor J. The law of conservation of mass/matter, also known as law of mass/matter conservation (or the Lomonosov - Lavoisier law says that the Mass of In Particle physics, the baryon number is an approximate conserved Quantum number of a system A chiral anomaly is the anomalous Nonconservation of a chiral current In High energy physics, the lepton number is the number of Leptons minus the number of antileptons The Standard Model of Particle physics is a theory that describes three of the four known Fundamental interactions together with the Elementary particles In Particle physics, flavour or flavor (see spelling differences) is a Quantum number of Elementary particles related to their The weak interaction (often called the weak force or sometimes the weak nuclear force) is one of the four Fundamental interactions of nature In Physics, a parity transformation (also called parity inversion) is the flip in the sign of one Spatial Coordinate. In Particle physics, CP violation is a violation of the postulated CP symmetry of the laws of physics A continuity equation is a Differential equation that describes the conservative transport of some kind of quantity Philosophy of physics is the study of the fundamental philosophical questions underlying modern Physics, the study of Matter and Energy Noether's theorem (also known as Noether's first theorem) states that any differentiable symmetry of the action of a physical system has , 2000. Timeless Reality: Symmetry, Simplicity, and Multiple Universes. Prometheus Books. Chpt. 12 is a gentle introduction to symmetry, invariance, and conservation laws.

External links

• Conservation Laws — an online textbook