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KS1 Science at Home: Week 5

An experiment for you to try at home.....

Key Stage 1 Experiment of the Week! – Storm in a glass

How does it work?
Clouds in the sky hold onto water. They can hold millions of gallons! The layer of shaving cream is our pretend cloud in this experiment. The shaving cream layer can also hold onto water. Clouds can’t keep storing more and more water forever, eventually they get too heavy. When that happens, the water falls out (precipitates) as rain, snow, sleet, or hail.

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If you want to watch a video of how the experiment is done, click here.

Materials you need

  • Shaving cream
  • A large glass
  • water
  • Food colouring
  • A spoon


  1. Fill the glass 1/2 full with water
  1. Spray some shaving cream on top of the water to fill the glass to ¾ full.
  1. Use your finger or a spoon to spread the shaving cream evenly over the top of the water. The top of the shaving cream should be flat.
  1. Mix ½-cup water with 10 drops of food colouring in a separate container.

5. Gently add the coloured water, spoonful by spoonful, to the top of the shaving cream. When it gets too heavy, watch it storm!

Questions to think about

Try more water and less shaving cream, or less water and more shaving cream. Which one looks more like a drizzle, and which one looks like a downpour?

Some research for next week: Is carbon dioxide strong enough to pick things up? We will answer this question with next week’s science experiment!