Flux density is defined as electric flux per unit area, while divergence is defined as flux per unit volume. The discussion clarifies that flux density and the divergence of the electric field (E) are distinct concepts. Specifically, flux density relates to the electric field divided by the area vector, whereas divergence quantifies how much electric field lines spread out from a point. This distinction is crucial for understanding electromagnetic theory.
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I think flux density is electric field / unit area vector...Gordianus said:Divergence is defined as flux per unit volume