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Originally Posted by MolsonInBothHands
Wow, that makes sense. I'm still trying to wrap my head around momentum without mass though. Layman's terms for quanta might help. Off googling I go, my employer didn't want me to be productive anyway.
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It might help to remember that while light has no mass, it does have energy (and energy and mass are interchangeable).
I think this used to be referred to light not having a rest mass but having a relativistic mass, but I don't think they use that anymore.