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Moving or Dancing Grapes
Materials:
- Seltzer water
- One glass cup
- Some grapes
Directions:
Fill the glass 3/4 full with seltzer water. Add the grapes and observe as they sink, then float to the top as bubbles attach to them. Once at the top, the bubbles pop, and the grapes sink again. This “dance” will continue as long as there are bubbles in the water
Why is this happening?
This process is called buoyancy. Grapes are denser than water, so they sink. However, the carbon dioxide bubbles in the seltzer water attach to the grapes, causing them to float. When the bubbles pop, the grapes sink again, and the cycle repeats.
Note:
You can substitute grapes with raisins, dates, or corn kernels for similar results.