也有许多massless particles，e.g. photons

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送交者: pgss 于 2016-02-24, 00:14:33:

回答: 一点小更正，物质不一定有体积，电子就是point particle 由 pgss 于 2016-02-24, 00:09:39:

i think the definition is that, if it is not void, then it is matter. and vacuum is void, everything else is matter.

the language of Mr Sai is really imprecise though, look like written by an amateur.



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