Science Projects for Kids: States of Matter

Soda Pop in a Balloon

©2007 Publications International, Ltd.                              Soda pop in a balloon.
©2007 Publications International, Ltd. Soda pop in a balloon.
2007 Publications International, Ltd.

Gases can dissolve in a liquid, as this example of soda pop in a balloon shows. But they won't stay there if you release the pressure that holds them. Try this science project for kids on states of matter, and see what happens.

What You'll Need:

  • Bottle of soda pop
  • Balloon
  • Watch

Step 1: Open a bottle of soda pop, and set it on a table.

Step 2: Immediately slip the end of a balloon over the neck of the bottle. Pull the balloon's end well down over the bottle so that it fits tightly.

Step 3: Check on the balloon about every 10 minutes for any changes.

What Happened?

Soda pop is carbonated. This means that carbon dioxide gas has been dissolved in the liquid under high pressure.

Opening the bottle releases the pressure, and the carbon dioxide gas begins to escape from the liquid. The balloon trapped the carbon dioxide gas as it left the bottle, and then the gas inflated the balloon.

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