Blow Between Two Cans

Cans move toward each other instead of apart. Ask students to predict what will happen. Place cans close together and blow through the gap. Key idea: Faster air between them has lower pressure; outside air pushes inward. Ask: Why didn't the air push them apart? Safety and cleanup: Teacher blows; cans stay on table. https://www.google.com/search?q=%22Blow+Between+Two+Cans%22+science+demonstration+experiment