Dancing raisins
Raisins usually sink in water, but with a special ingredient you induce buoyancy.
Here you see how!
You need:
- Five raisins (plus a few extra for tasting)
- A glass
- Fizzy water
This is what you do:
Fill the glass with carbonated water.
Add the raisins. Eat some other raisins while you wait for something to happen in the glass.
Observe:
Using your senses to observe the experiment. What do you see? What's up? Can you hear anything? Do you smell something?
Record your observations.
Leave the jar for a couple of days. Smell the liquid again. Does it smell different?
Record your observations.
What is going on?
The carbon dioxide in the water forms small bubbles around the raisins. The bubbles are lighter than water and rise to the top. When enough bubbles have settled around the raisins, they will bring the raisins up to the surface. There the bubbles burst, and the raisins, which are heavier than water, fall back down. They almost look alive!
