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What is air pressure and how does it work?

The Invisible Push
What is air pressure and how does it work?
~~Right now, this very second~~, the air is pushing on you. **From every direction, all at once** — your nose, your knee

Right now, this very second, the air is pushing on you. From every direction, all at once — your nose, your knees, the back of your neck. You don't feel it, but it's there. We call this gentle, invisible push air pressure. So what is it, really? Let's go meet the troublemakers.

Air isn't empty. It's a crowd. A wild, bouncing crowd of tiny molecules — bits of oxygen and nitrogen so small you'll never see one. And they are never, ever still. They zoom around at hundreds of miles per hour, slamming into everything they meet.

How was this book?