Photons may not have rest mass, but they do carry momentum and energy. These parameters are at a magnitude determined by E=MC^2.
Dave -----Original Message----- From: Eric Walker <eric.wal...@gmail.com> To: vortex-l <vortex-l@eskimo.com> Sent: Tue, Feb 3, 2015 11:42 pm Subject: Re: [Vo]:vortex mass On Tue, Feb 3, 2015 at 7:54 AM, David Roberson <dlrober...@aol.com> wrote: It would have been a surprise to find that nanovortices did not have mass since they obviously have energy. Mass is a tricky thing. Photons have no rest mass, for example, even though they can carry as much energy as you can put into them. But they do follow the contours of spacetime, almost as if they had mass. (I wonder, here, whether physicists have gotten themselves into another language game with this one.) Eric
