The classical way of demonstrating surface tension.
When talking about surface tension, the classical thing to do is to talk about the shape of drops of water.
![IMG_6525](https://mirjamglessmer.com/wp-content/uploads/2014/05/img_6525-300x220.png)
Water drop on a coin.
As seen before in this post, the drops of water act as lenses.
It is pretty amazing how much water you can pile on a single coin!
If you can’t see it from the photos, here’s a video. But rather than watching the video, you should try it yourself. It’s fun!
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