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Scuba Fruit Experiment

Scuba Fruit

Get raisins to float with the help of bubbles of carbon dioxide.

Dissolved carbon dioxide gas (CO2) gives soft drinks their familiar bubbles and tingly taste. The wrinkly surface of a raisin is perfect for trapping these bubbles for a buoyancy boost!

Materials Checklist

Questions and Things to Notice


  1. Scuba Fruit Experiment Step 1
    Step 1

    Fill the glass will seltzer water until it is about 3/4 full. This experiment is a lot more fun with a taller glass.

  2. Scuba Fruit Experiment Step 2
    Step 2

    Drop several raisins into the glass and observe. It might take a few seconds for something to start happening, so be sure to take a close look at how the bubbles of carbonation in the selzter are helping the raisins to float.

  3. Scuba Fruit Experiment Step 3
    Step 3

    If you have them, try dropping in some other light, small objects, such as grains of rice or oats. How do they act? See if you can predict which objects will float and which will sink.


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Materials Checklist