Approximate Laws
There are also approximate conservation laws. These are approximately true in particular situations, such as low speeds, short time scales, or certain interactions.
- Conservation of mass (applies for non-relativistic speeds and when there are no nuclear reactions)
- 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
- Invariance under Charge conjugation
- Invariance under time reversal
- CP symmetry, the combination of charge and parity conjugation (equivalent to time reversal if CPT holds)
Read more about this topic: Conservation Law
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“As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.”
—Albert Einstein (1879–1955)
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