Particle displacement

When you shake something, like a tambourine or a toy rattle, it moves up and down really quickly. This movement creates sound waves that you can hear. These sound waves are made up of tiny particles that are moving back and forth really fast. This movement is called "particle displacement".

Think of each particle as being like a tiny ball. When the sound wave moves through the air, the balls move too. But they don't move forward like a normal ball would. Instead, they move back and forth, just a little bit.

When you hear a sound, it's because these particles are moving. And the way they move creates different sounds. For example, when you sing a high note, the particles move really quickly. This creates a high-pitched sound. When you sing a low note, the particles move more slowly. This creates a lower-pitched sound.

So, in summary, particle displacement is when tiny particles like balls move back and forth really fast, creating sound waves that we can hear.