pressure, powietrze, wytrzymałość materiałów
Participants attempt to drill a hole in a hard raw potato using a soft drinking straw (with a large diameter, no bend).
Mind your hands!!
A soft straw will bend when stuck into a raw potato as the air inside it flows freely. A straw with one end closed will not bend because it contains air that has nowhere to escape. When the straw is stuck into the surface of the potato the air pressure rises inside the straw. Its walls retain their shape, and with adequate strength you can drill a hole in the potato.
The experiment can be made using other hard vegetables and fruit. This way you can decorate your vegetable salad.