Khan Academy Static

Using Green's theorem (which you should already be familiar with) to establish that the "flux" through the boundary of a region is equal to the double integral of the divergence over the region. We'll also talk about why this makes conceptual sense.

6781_2D_divergence_theorem.html

6780_Constructing_a_unit_normal_vector_to_a_curve.html

6782_Conceptual_clarification_for_2D_divergence_theorem.html