A conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves. The physical result concerning conservation laws is Noether’s theorem. This theorem states that there is a one-to-one correspondence between conservation laws and differentiable symmetries of physical systems.

Exact laws are conservation laws that are said to be more precise and never been shown to be violated. A list of exact laws is as followed

- Conservation of mass-energy

- Conservation of linear momentum

- Conservation of angular momentum

- Conservation of electric charge

- Conservation of color charge

- Conservation of weak isospin

- Conservation of probability

- CPT symmetry

- Lorentz symmetry

Approximate conservation laws are approximately true in particular situations. These situations can be low speeds or short time scales.

- Conservation of mass

- Conservation of baryon number

- Conservation of lepton number

- Conservation of flavor

- Conservation of parity

- Invariance under time reversal

- CP symmetry