Pandai Lab 5: Sound Experiment

Sound is caused by vibrations traveling through a medium. Loud sounds can make nearby objects vibrate. So, Pandai Lab 5 brings you to learn about sound experimentation! This experiment, you can see and hear the sound vibrations. It is cool, right?

On 3 November 2020, you will discover how music creates vibrations you can see using salt and a portable speaker! Then try experimenting with different genres of music to see which ones make the salt dance more. 

Here the details:

Date: 3 November 2020

Title: Sound Experiment

Materials: a plastic cup, a balloon, scissors, salt & a speaker. 


1. Cover the plastic cup with the balloon. You want to make sure to stretch the balloon wrap very tight across the top of the plastic cup.

2. Wrap the rubber band around the plastic cup to hold the balloon wrap in place.

3. Place the bowl very close to a speaker.

4. Sprinkle some salt on the balloon wrap.

5. Play your favorite music through the speaker. Turn the volume up and watch what happens to the salt!

What makes this possible and happened?

This experiment is all about sound. Sound is caused by vibrations traveling through a medium. In the string telephone experiment, we saw that sound can travel through the air to the cup, then through the string, to the cup on the other side, and eventually reaching our eardrum. When you place the bowl next to a speaker, vibrations in the speaker moved through the air and reached the balloon wrap. Speakers, like your bluetooth speaker, produce sound by creating vibrations in the air. Normally, we only hear these vibrations, and we can’t easily see them. Balloon wrap, though, is lightweight and thin enough to vibrate in response to the sounds coming from the speakers. These vibrations move through the balloon wrap unevenly, pushing and shoving the salt around in interesting patterns. As a song progresses, these vibrations change, and the salt moves as if it were dancing.

You can check the reference on this link for more details:

Check out this video Live Pandai Lab 5 for you:

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