Easy science experiment for kids: Water surface tension

Here follow my instructions for the water surface tension experiment. We will use water and cinnamon since it is really a special spice. It is very dry, as you notice if you would try to swallow it with a teaspoon. And no, don’t try that yourself, you can search for YouTube after the “cinnamon challenge”.

Remember to start the experiment with a hypothesis, what do you think will happen?

Instructions for parents: Read this first.

Material included:

  • Cinnamon
  • Liquid soap
  • Cotton swab

Additional things you will need:

  • A glass
  • Water


  1. Pour water into the glass.
  2. Powder over cinnamon so it covers the surface of the water.
  3. Dip a finger into the cinnamon/water
  4. What happens?
  5. Now take the cotton swab and dip it into the liquid soap, and place it in the center of the glass.
  6. What happens now?


The properties of the water and the cinnamon do not work well together, and therefore these two substances are not easily mixed. So when you put your finger in the glass, the cinnamon will form a layer between you and the water and you will not get wet.

In your glass of water or a lake, there is something called surface tension. It is a force that can be compared to a thin barrel on the water. That is why some insects can walk on the water surface

When you dip the liquid soap into the water, the surface tension is destroyed and the cinnamon moves away.

To see others do the experiment look at this video:

Click the link to get to my Kids Christmas Calendar.

Do you have any questions or comments about the experiment? Just leave a comment below!



Be the First to comment.

Leave a Comment

Your email address will not be published. Required fields are marked *