CalcBLUE 4 : Ch. 7.2 : Curl, Div, & Green's

From a channel Lumen includes in full: Prof Ghrist (Robert Ghrist, University of Pennsylvania) teaches calculus, linear algebra and applied topology with distinctive hand-drawn animated lectures.

A 3-minute video from Prof Ghrist Math's catalogue; the title names its topic.

Video by Prof Ghrist Math, played through YouTube's embedded player.