what is a mass of a particle ?
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The first (in green) is that mass is something that does not change with speed — often called “invariant mass” or “rest mass”, it is used by particle physicists. The other, “relativistic mass”, is just energy divided by c-squared, and grows with speed.
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The electron that has a mass approx. 1/1836 that of a proton. Proton have mass of approx one atomic mass unit1.67×10^- 27 kg.
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