Wax Paper Drop Race

Drops bead and move differently on each surface. Ask students to predict what will happen. Place equal drops on different surfaces and gently tilt. Key idea: Attraction between water and the surface changes the contact angle and motion. Ask: Why does water spread on one surface but bead on another? Safety and cleanup: Small water amounts only. https://www.google.com/search?q=%22Wax%20Paper%20Drop%20Race%22%20science%20demonstration%20experiment