Fun with Vortex Rings in the Pool Create half-ring vortices in a pool by sliding a plate through water and adding food coloring to the ends. Facebook Prev Article Next Article Experiments Checkout these cool gadgets... Related Posts Wind tunnel testing shows old methods still work Think You’re Tough? Try This Feat of Strength! Dyson Vacuums Will Suck Up Fire Traffic Jams Recreated And Studied Ever Seen a Liquid Simultaneously Freeze and Boil? Compilation of Amazing Science Experiments