In this simple presentation, we see how siphons work. I asked Alex and Max to pay attention and tell me at what level should be water so that it starts going through the straw. So they did, had fun and learned something new. A siphon can lift the water up without a pump, and that is the reason it has been used for thousands of years. But even today it is not 100% clear why it works. Perhaps the challenge is there because a few processes are happening at the same time for siphons to work. On the

There's a greedy cup siphon in your washing machine fabric softener try. Also called a Pythagorean cup. It's also used in urinals and novelty drinking receptacles. It's an example of a fluid dynamic mechanism. | Steve Mould

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