The boys also enjoyed the dancing raisins experiment during Science Week. They put raisins in fizzy water and observed what happened.
Raisins are denser than the liquid in the fizzy water, so initially they sink to the bottom of the glass. The water 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.
The boys loved watching their raisins dance!
