Magic Milk Surface Tension Kids Science Experiment


Here is a fun science experiment your little one will love! And what you need for it, you probably already have in your kitchen.

You will need:

  • a shallow plate or a dish
  • cream, half-and-half or full-fat milk (we tried this experiment with skim milk and it did not work)
  • food coloring
  • liquid soap

Pour the cream onto the plate. I am using a shallow plate so I don’t need to use a lot. Make sure the cream covers the bottom on the plate. Add drops of food coloring (don’t add too much or you will end up with the color brown instead of a rainbow). Next, dip a Q-tip into soap and submerge that Q-tip into milk. Observe what happens! Discuss the magic of surface tension.

Science mystery revealed: The liquid soap breaks the surface tension and the milk molecules move apart. The molecules of the milk pull each other together which stretches the surface of the milk into an invisible skin. This effect is called surface tension. Adding the liquid soap weakens the surface of this surface tension and makes the molecules move around. This makes the food coloring mix together.

See this video on YouTube here.

Please, always supervise your children during any science experiments.

See this post on Instagram here.

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