We wanted to find a fun way to show sound waves and vibrations.
What we did:
We made Ooblek using cornflour and water (3 parts cornflour to 1 part water).
It was a liquid and a solid. When we made loud vibrations near it, it made a solid.
We watched how it danced!
Ooblek was put over the speaker and the loud sound and vibrations made the Ooblek bounce, bubble and dance.