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What is mass? And how does it differ from charge? Is mass a substance
Well, I've always assumed that a substance is a collection of elementary
particles such as quarks, leptons and bosons. But now I think I'm being
told that the properties of such a substance can also be called a
substance. I believe that an aggregation of protons, neutrons and
electrons is a substance; but I'm having trouble accepting that the
charge property of their constituent Fermions is also a substance.