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 Think You’re Tough? Try This Feat of Strength! Liquid Oxygen Experiment – Melting Pop Can Would You Lie Tilted Backwards For 60 Days For Science? Liquid Nitrogen and 1500 Ping Pong Balls How Many Strips of Packing Tape Does It Take To Lift A Car? A sword made of fire is kind of cool