 It's absolutely enormous. Just the impact of all these little air molecules bouncing off your front. Now why doesn't it just push you over? Well, of course, there's that pressure coming in on one side of you, but there's also the same pressure coming in on the other side of you, the air on the other side too, and so that balances out. But wouldn't it crush you? Well, if you consider your skin and zoom in close, it's made of cells, and each cell has water inside. And the water inside is at the same pressure as the air outside. The water molecules in there are banging into you. So the pressure from the outside, or the air molecules banging into, is perfectly balanced by the pressure from the water molecules inside. And likewise, you might have veins and blood flowing through it, and the air in there is also moving at the same speed and bashing into you. You've got your lungs with air inside, they're all bashing into you. So it's kind of strange. We live in the middle of this absolutely staggering force, 100,000 Newtons of force for every square meter of area, but we normally don't feel a thing because it's so perfectly balanced. The force from inside and outside balances perfectly. If it wasn't balanced, it would be in trouble. For example, if we connected a vacuum pump to our lungs and sucked all the air out, the pressure on the outside would collapse our rib cage. Luckily, the air inside our lungs is at the same pressure as the air outside.