A vector quantity or quantum number assigned to subatomic particles and atomic nuclei and having values such that similar particles differing only in charge-related properties (independent of the strong interaction between particles) can be treated as different states of a single particle.
- In short, they are similar to electric charge, isospin, and all the other internal quantum numbers of elementary particles.
- This symmetry is related to the concept of isospin, and is not the same as charge conjugation.
1960s: contraction of isotopic spin, isobaric spin.
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