The next time you’re eating some dried grapes take some time out for this little experiment. Poor a tall glass of clear carbonated liquid (7up or Sprite), turn on some tunes (“I heard it through the grave vine” by Marvin Gaye), and add some fresh Raisins. Not only is it a mesmerizing ‘music video’ but it’s also a great demonstration of buoyancy. As the bubbles accumulate on the outside of the raisins they become less dense than the liquid and float. When the raisins reach the surface and the bubbles pop and this sends the raisins back down. You can also explore other materials that float and sink and why grapes don’t work. Enjoy the Dance party in your kitchen!
Dean Whitfield
Science & Math Department Chair
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