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KS1 Science at Home: Week 11

Key Stage 1 Experiment of the Week! – Dancing raisins!

How does it work?

3 dancing raisins

In the still water cup, the raisin sinks because the raisin is denser than the water.

In the fizzy water cup, the raising is again denser than the water. However, the bubbles get trapped in the grooves of the raising, helping it to float back to the surface. When the bubbles pop, the raisin sinks back down.

Materials you need

  • 2 raisins
  • Still water
  • Fizzy water
  • Two clear, plastic cups

Instructions

1. Pour some still water into a clear, plastic cup.

2. Gently, drop in a raisin into the water. Did it float or sink?

3. Pour some fizzy water into a different clear, plastic cup.

4. Gently, drop in a raisin into the water. Did it float or sink?

Questions to think about

  1. What was the difference between the two reactions?
  2. Why do you think this was?