Crazy pool vortex

By: Physics Girl

Originally Published on Nov 22, 2014

This unique phenomenon can be easily reproduced in your pool on a sunny day.

Many thanks to the Vlogbrothers for their sponsorship of this video!

Also thank you to Daniel Walsh for answering many fluid dynamics questions, to Jacob Schalch for filming the burning penny, and to Justin and Brendan for their donations to support Physics Girl!


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