Use a balloon to amplify sound like speakers - Fun Science Experiments for Kids

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Enjoy fun science experiments for kids that feature awesome hands-on projects and activities that help bring the exciting world of science to life.

Use a balloon to amplify sound like speakers Use a Balloon to Amplify Sound

Small sounds can still make a big noise when you use a good sound conductor. Experiment with a balloon, compressed air and your own ears to find out how it works and the science behind it.

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What you'll need:

Balloon

Instructions:

Blow up the balloon.
Hold the balloon close to your ear while you tap lightly on the other side.

What's happening?

Despite you only tapping lightly on the balloon your ears can hear the noise loudly. When you blew up the balloon you forced the air molecules inside the balloon closer to each other. Because the air molecules inside the balloon are closer together, they become a better conductor of sound waves than the ordinary air around you.

Use a balloon to amplify sound