Ready for the coming school holiday? Spend 5 mins with your kids with some easy science experiments.
Do you think a raisin will sink or float? Do you think the type of drink depends on what it does? In this science experiment, let’s make some raisins dance!
What You’ll Need:
- A clear, fizzy, drink (like ginger ale or sprite)
- Tall clear glass
- Handful of raisins
Pour your fizzy drink into the tall glass. Notice the bubbles coming up from the bottom of the glass. The bubbles are carbon dioxide gas released from the liquid. Drop a few raisins into the glass. Watch them for a few seconds and try to describe what is happening. Do they sink or float? Now, keep watching!
What’s the science here?
Raisins have a higher density than the liquid in the glass, so they sink to the bottom. Carbon dioxide bubbles attach themselves to the raisins increasing their volume while adding very little to their mass. With greater volume, the raisin displaces more fluid. This causes the water to exert greater buoyant force, pushing the raisins upwards to the top of the liquid. Once they reach the top, the carbon dioxide escapes and the raisins sink again!