Is there anything lighter than light?(adsbygoogle = window.adsbygoogle || []).push({});

A photon has zero rest mass. However it has energy which is equivalent to some mass (?)

Angular momentum is energy (?).

The angular momentum of, say, a photon would have some energy.

If we were to convert (mathematically) that energy into mass, what would the value be? (in relation to the relativistic mass of a photon)

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# Does momentum have mass?

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