Heron's Fountain

Water jets upward with no pump. Ask students to predict what will happen. Pour water into top basin to start fountain. Key idea: Falling water compresses trapped air, which pushes water up another tube. Ask: What invisible thing is pushing the fountain water? Safety and cleanup: Use sealed plastic bottles; tray underneath. https://www.google.com/search?q=%22Heron%27s+Fountain%22+science+demonstration+experiment