So why do they dance ?
Raisins are denser than the liquid in the lemonade, so initially they sink to the bottom of the glass. The carbonated soft drink releases carbon dioxide bubbles. When these bubbles stick to the rough surface of a raisin, the raisin is lifted because of the increase in buoyancy. When the raisin reaches the surface, the bubbles pop, and the carbon dioxide gas escapes into the air. This causes the raisin to lose buoyancy and sink. This rising and sinking of the raisins continues until most of the carbon dioxide has escaped, and the soda goes flat. Over time the raisin gets soggy and becomes too heavy to rise to the surface.
2 comments:
What a cool experiment - science is so fun.
Thanks for sharing your learning at school.
What a brilliant experiment - I've never seen that before but it makes perfect sense after seeing the photos and reading the explanation. WE will definitely try this at home.
Camille and Barney
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