Is the space between the electron shell and nucleus a perfect vacuum?

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The space between the electron shell and the nucleus is not considered a perfect vacuum, as there is no distinct "space" separating them. The radial probability distribution of electrons extends inward to the nucleus, indicating a continuous presence rather than a void. The concept of a "perfect vacuum" requires further definition, as it can vary based on context. Overall, the discussion emphasizes the non-existence of a true vacuum in atomic structure. Understanding these principles is crucial for grasping atomic behavior and electron distribution.
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Is the space between the electron shell and nucleus a perfect vacuum?
 
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jtbell is right, but also, you would have to define the term "perfect vacuum".
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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