I know you have not taken the Fluid Mechanics course, so you are certainly excused for the little faux pas! … but Bernoulli’s principle applies strictly “following the streamline”, i.e. for one parcel of air as it moves from one place to another. Interestingly, though, the way to prove that the core of a vortex is at lower pressure is the similar to a way to prove Bernoulli’s principle, but moving perpendicular to streamlines!

I hope I’ve piqued your curiosity, and you’ll be eagerly awaiting your Fluids course. ]]>