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In practice the definition of what is meant by empty space has to be examined because the definition of what is considered to be matter occupying space is related to the range of forces (strong, weak, em) that may extend from its constituents.
Maybe you should put the question in form of 'densities' instead And the 'density' of a electromagnetic field would then be?
Yes, it should have one, nicely done Lightarrow . Now we just have to put it into consideration by shoving the resistance experienced by, for example a bit of invariant mass, like a human moving inside and relative that EM-field.
When considering an atom, what percentage of the volume is "empty" space?
That it might be called, or the EM-fields general resistance to my body, walking through that 'cloud' of EM? It's sort of interesting