What is sound and how does it travel through the air to our ears?
The Wiggle Express
What is sound and how does it travel through the air to our ears?
Clap your hands. Right now — go on. That little burst you heard? It just took a tiny journey through the air to reach you. Sound is one of the most ordinary magic tricks in the world, and almost nobody knows how it actually works. Let's fix that.
Here's the first surprise: the air is not empty. It's packed wall to wall with countless tiny specks called air molecules, drifting and bumping around like an invisible crowd in a very full room. You walk through them all day without noticing. But they're the secret to the whole story.
