Gauss's Law

(see integral)

This means E-field is nothing but electric flux density. From Interpretation of Integrals, we can easily see how Gauss's law holds.

"True" from of Gauss's law is:

where .

The units of end up being coulombs per meter squared. In fact, is nothing but charge density (like ). Once again, from Interpretation of Integrals, we can see how Gauss's law is formed.