Water Tension Holes

This is a very simple experiment looking at water tension!

What you will need:

A big bowl of water

Some ground pepper (black so you can see it) or any other ground product with colour

Some washing up liquid



Let the water go still and sprinkle you ground pepper over the top

In the middle of the bowl drip some washing up liquid and watch the effect!

You should see a ‘hole’ starting to appear in the centre and the pepper moving outwards as it gets bigger!

The Science Bit!

The hole is caused by the soap breaking the surface tension of the water, then the tension of the rest of the water pulls the floating pepper away from the soap!


Written by Kerry from Multiple Mummy





Author: Emma Vanstone

Science Sparks, is a site dedicated to making Science fun for kids. I’d love you to follow me on my Google Profile+.

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  1. Great activity, I am going to try it with my daughter! I love how you call it “washing up liquid” – I call it that too. :)

    Post a Reply
    • Thanks, glad you like it!

      Post a Reply


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