field will accelerate more than a proton placed in the same field because of its lighter mass), and the symmetry is said to be broken.

It was noted that charge (Q) was related to the isospin projection (I₃), the baryon number (B) and flavour quantum numbers (S, C, B´, T) by the Gell-Mann-Nishijima formula:
: where S, C, B´, and T represent the strangeness,