Seeing sound

Materials we used for our science experiments:

Jar

Balloon

Scissors

sugar

Step 1: We cut the end of the balloon.

Step 2: Stretch over top of jar.

Step 3: Sprinkle sugar on top of the balloon and finally we had to humming to make the sugar vibrate.

Conclusion: We notice that when we were making a humming the sugar was bouncing up and down.

Do you think the sound make the sugar bounce up and down or was it your breathe or your nose.