Carbon dioxide gas dissolved in soft drinks gives them their fizz. You can use the carbon dioxide
fizz from a soft drink to make raisins dance. The dancing raisins experiment is not only a classic
but fun to watch as well.

Materials
- A can of colorless soda (e.g., 7-Up or Sprite)
- A tall, clear glass or plastic cup
- Several raisins (fresh raisins work the best)


Watch The Dancing Raisins Video


















Process Dancing Raisins Experiment:

Pour the can of soda 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 6 or 7 raisins into the glass. Watch the raisins for a few seconds. Describe what is
happening to the raisins. Do they sink or float? Keep watching; what happens in the next several
minutes?

The Science Behind The Dancing Raisins Experiment

Raisins are denser than the liquid in the soda, 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. Furthermore, with time the raisin
gets soggy and becomes too heavy to rise to the surface.

You might want to try other objects to see if they exhibit this behavior. Any object whose density is
just slightly greater than water’s and has a rough surface to which the gas bubbles can attach
should be able to dance in the carbonated water. Some of the more common dancing substances
are mothballs and pieces of uncooked pasta. Try putting other objects in the carbonated water.
Can you find other substances that dance?

Carbonated beverages are prepared by putting the beverage into a can under high pressure of
carbon dioxide gas. This high pressure causes the carbon dioxide gas to dissolve in the liquid.
When you open a can of soda, the noise you hear is produced by the carbon dioxide gas as it
rushes out of the can. When the can is opened, the decreased pressure allows some of the
carbon dioxide gas dissolved in the liquid to escape. This is what makes the bubbles in a soft
drink.

Another way to do this experiment is to generate the carbon dioxide gas using the reaction of
baking soda and vinegar. Fill your glass about 1/2 full with water. Add one teaspoon of baking
soda and stir until it is dissolved in the water. Add 6 or 7 raisins to the glass. SLOWLY pour in
vinegar until the glass is about 3/4 full. The vinegar and baking soda react to form carbon dioxide
bubbles, and the raisins will dance just as in the soft drink!  Now go do the dancing raisins
experiment with some friends!
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
Dancing Raisins www.weirdsciencekids.com
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