15min STEM activity: How many drops of water can a penny hold?

15min STEM activity: How many drops of water can a penny hold?


 Here’s our review of the 15min STEM activity ‘how many drops of water can you fit on a penny?’

We began by collecting up our resources and found it was worth taking some time to practise using a pipette before we began the experiment. Placing just one drop of water on the penny at a time was more of a challenge than expected!

Our next step was to begin the count. With each drop, we were amazed to see the water molecules joining together. By drop number 20, the water was still clinging on to the penny in an impressive display of surface tension.


Eventually the gravitational pull overpowered the surface tension of the water and the droplets spilled over the edge of the penny.

After mopping up the water with our paper towel, we had another go, this time with the other side of the coin. We were surprised by the difference in water droplets that each side of the coin could hold. We’ll let you investigate this for yourself and see what you find…

Download our our 15min STEM activity ‘how many drops of water can a penny hold‘ resource here.

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  1. Hi there! Would you mind if I share your blog with my facebook group? There’s a lot of folks that I think would really appreciate your content. Please let me know. Thank you

    1. Author

      Of course! Please send us the link to the facebook page so we can see the post.

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