The Jumping raisins
Who knew raisins could be so entertaining? With a little water, soda water, and a few old grapes, your kitchen will become a laboratory for understanding how buoyancy works.
What you'll need
· Two large, clear glasses
· Clear soda water with a lot of bubbles
· Water
· At least eight or more raisins
How to do it
- Fill one glass with water and the other with soda water.
- Put about four or more raisins in each glass of water and observe.
This is what it should look like.
- The raisins should sink in water.
- · In soda water, the raisin should sink and then float, and then sink and float again.
- · Discuss what happened to the raisins with your students
Answer
· This discrepant event is regarding buoyancy.
· The raisins float in soda water because the bubbles attach to the raisins, making them rise to the surface. At the surface the bubbles detach and the raisin sinks. Then the cycle repeats.
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