Heron's Fountain
Water jets upward with no pump.
Teaching & key ideas
What you do: Pour water into top basin to start fountain.
What students see: Water jets upward with no pump.
Why it works: Falling water compresses trapped air, which pushes water up another tube.
Question to ask: What invisible thing is pushing the fountain water?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What invisible thing is pushing the fountain water?