Bouncing Water Drop on Hydrophobic Surface

Drops bead and may bounce/roll. Ask students to predict what will happen. Drop water from low height onto surface. Key idea: Weak adhesion plus strong cohesion keeps drops rounded and mobile. Ask: Why doesn't the water spread out? Safety and cleanup: Small drops only. https://www.google.com/search?q=%22Bouncing+Water+Drop+on+Hydrophobic+Surface%22+science+demonstration+experiment