Use this fun hands-on experiment to give students practice with the scientific method. Students will place raisins in clear soda, in water, and in a soda-water mixture.
The raisins should initially sink to the bottom of each cup (because raisins are more dense than the liquid). However, when carbon dioxide in the soda is released, the bubbles attach to the raisins and make them more buoyant, so they float toward the top. When the bubbles "escape," the raisins sink back to the bottom of the cup again. This up and down cycle makes the swimming raisins appear to "dance."