Graphic Fluid Pressure Demonstration
For a large, dramatic presentation your whole class will love, just set up Hero’s Fountain, put it on a counter, and pour water in its top — the fountain spouts into the open air for several minutes. Water in the fountain’s top reservoir enters the lower bulb, which contains air. Air is forced up to the top bulb, compressing the air in that bulb, and forcing the water to spout out of the upper tube. Entire unit is 50cm high.