Tons of Air Press On You Why Aren't You Crushed

Right now, the air is pressing on you with tons of force. So why don't you feel a thing?

At sea level, the atmosphere pushes at about 14.7 pounds per square inch. Across your whole skin, that adds up to forces on the order of tons. You should be flattened. You aren't.

Here is the trick. Air does not just press down. Pressure in a fluid pushes equally in every direction: down, up, and sideways. And you are not empty. Your blood, your tissues, and the air in your lungs all push back outward with the same pressure. Inside and outside meet at your skin and cancel out. On top of that, your body is mostly water, which barely compresses. So the squeeze has nothing to crush.

That balance is why a sudden change hurts. Climb fast or dive deep, and the outside pressure shifts before your insides catch up. The leftover force is tiny, yet that is the ache you feel popping in your ears.

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