Music and Math Project

What is sound?

The air is made out of little particles, called molecules. They always move around a bit, but sometimes, for instance when you pluck the string of a guitar, the molecules around the string will start vibrating together. Then together they will repeatedly push into the molecules next to them. In turn, these molecules will push into their neighbors. This goes on in a wavelike motion that spreads out around the guitar string, until finally the molecules close to your ear vibrate as well. This vibration can be picked up by your ear. Your brain registers the molecules are moving, and you perceive this as hearing sound.