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RE: Super Cool Science S#!t #14 - Atoms the size of cities
This was an excellent article. One thing I didn't quite follow is the mass density of the magnetic field being 10,000x heavier than lead. Any chance you could explain that more, because I thought a magnetic field doesn't have mass?
The mass density of a magnetic field describes the density of mass being carried along the magnetic field lines. You are correct in thinking that electromagnetism is a force :D
Does that help to explain it? Probably could have done better about that in the OP
Yes it does, thank you!