Tornado in a Bottle

A visible funnel forms. Ask students to predict what will happen. Swirl water strongly before letting it drain. Key idea: Rotating water forms a vortex with lower pressure near the center. Ask: What shape does the spinning water make? Safety and cleanup: Use plastic bottles. https://camden.ces.ncsu.edu/wp-content/uploads/2021/01/Tornado-in-a-bottle-v3.pdf?fwd=no