Comment by cyberax
> No, EM waves do not have mass. They are massless. They carry momentum and energy, yes, but not mass.
OK, EM waves can get _transformed_ into mass.
> No, EM waves do not have mass. They are massless. They carry momentum and energy, yes, but not mass.
OK, EM waves can get _transformed_ into mass.
> EM waves can get _transformed_ into mass.
In the sense that they can be absorbed by matter and (possibly) increase the invariant mass of the matter, yes.