Nearly 2,000 years ago, Hero of Alexandria designed a water fountain that used compressed air to lift water to a higher point than its origin. The same principles are at work in this table top demonstration.
As the water runs though from the top bottle into the bottle underneath, a small amount of water is forced up the tube in the upper bottle, spouting out of the top of the tube at a higher level than the water level in the upper bottle, and creating an elegant fountain.
Essentially the water in the upper bottle flows into the bottom bottle, and this increases the pressure in the bottom bottle. Air is forced up the tube, from the bottom bottle into the upper bottle. However this tube has some small holes in its side, and a bit of water is drawn up with the air, and gives the fountain effect at the top of the tube.
As the water runs though from the top bottle into the bottle underneath, a small amount of water is forced up the tube in the upper bottle, spouting out of the top of the tube at a higher level than the water level in the upper bottle, and creating an elegant fountain.
Essentially the water in the upper bottle flows into the bottom bottle, and this increases the pressure in the bottom bottle. Air is forced up the tube, from the bottom bottle into the upper bottle. However this tube has some small holes in its side, and a bit of water is drawn up with the air, and gives the fountain effect at the top of the tube.
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