Can you please give me an explanation as to why the air makes the water flow.My son needs to explain this?
Water bottle wonder:
Using a small nail, poke three or four holes around a plastic water bottle, about 1″ from the bottom (heating the tip of the nail will make this easier). Fill each bottle with colored water, and replace the cap. Set the bottles out on a table and encourage your kids to investigate. They will quickly find that opening the cap (thereby letting air into the bottle) allows the water to flow freely from the holes. When capped, it stops.
Consider a small bubble of air trapped at the top of the bottle. Initially this bubble is under the same pressure as the rest of the atmosphere. (Atmospheric pressure) This pressure is transferred to the water contained in the bottle also. As water drains out, this bubble of air has more room and expands. The amount of air is the same, but it is filling a larger volume, hence it has a lower pressure.
As soon as the sum of the pressure of the air in the top of the bottle plus the head pressure of the column of water is less than the atmospheric pressure, water will stop flowing out of the holes.
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