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- $\begingroup$ Well, charge, mass etc. are fixed properties of a particle that never change, they have just one fixed value. They are, in the usual quantum language, not thought of as "observables". Momentum and position are dynamical variables, in contrast. $\endgroup$Luke– Luke2018-04-12 10:13:57 +00:00Commented Apr 12, 2018 at 10:13
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