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When does the value of mass is 0?

Updated: 8/19/2019
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12y ago

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Mass can only be zero when energy is also zero. Einstein's mass-equivalence equation e = mc2 supplies the relationship between mass and energy. Since c2 is constant, i.e. about 9 x 1018 (m/s)2, in order for mass to be zero, energy must also be zero.

In the Standard Model, only the photon and the gluons are massless, that is, in their rest state.

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12y ago
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Q: When does the value of mass is 0?
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