Air-Pressure Bottle Fountain
Water shoots up the outlet tube.
Teaching & key ideas
What you do: Increase air pressure in bottle.
What students see: Water shoots up the outlet tube.
Why it works: Higher air pressure pushes on the water surface, forcing water up the tube.
Question to ask: What invisible material is pushing the water?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What invisible material is pushing the water?