When you think of speakers, loud sounds are typically the first thing that comes to mind. Speakers have amplifiers built in to make sounds louder. But did you know that a balloon may also be used as an amplifier to boost the volume?
HOW TO MAKE A BALLOON AMPLIFIER
- Fill the balloon with air.
- Hold the inflated balloon close to your ear.
- Tap the side of the balloon that is away from your face lightly.
- Do not do anything that will cause it to pop while it is near you, as loud noises like these can really hurt your ears!
So, what happens ?
You’ll hear a sound that’s significantly louder than the mild tapping of your finger.
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WHY DOES A BALLOON AMPLIFY SOUND
The air inside the balloon is tightly compressed. Pumping air into the balloon works as an air compressor, forcing air to inflate the rubber balloon. The air molecules inside the balloon are significantly closer together than they are in the rest of the room. Because the molecules in the air inside the balloon were so closely packed together, it became a greater conductor of sound waves. As a result, even a gentle tapping of your finger produces a greater sound.
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Finally, here are some of our book recommendation for science experiment with air for kids.
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