Film can, bottle top, straws and coins make a water pump.
A 5 mm diameter hole in the bottom of the film can is covered with a coin. 1 Kronor just fits the film can.
A bottle cap it sanded a bit until it slides inside the film can.
another 5 mm diameter hole is drilled in the center of the bottle top and covered with a coin.
A piece of wire goes across the bottle top and is attached to a straw.
The straw exits through the lid of the film can.
Pumping the straw up and down pumps water out of the film can.
Goran Lundstrom gave me this activity.
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Scientific Explorations with Paul Doherty
1 Feb 2000