# Why is there atmospheric pressure?

Why is there atmospheric pressure? Gas molecules have empty spaces between them right (intermolecular space). But to have atmospheric pressure all the gas pressure will have to line up without any space. Imagine lifting 3 boxes. Box 1 is stack ontop of box 2 and ontop of box 3. Between box 1 and 2, there is an empty space, and the same thing with box 2 and 3. If this is the case then I am only experiencing the weight(force) of 1 box not 3 boxes(because box 2 and 3 have spaces between them). This is how I imagine atmospheric pressure. I know this is wrong, but why is it wrong?

• There is space between the atoms of a solid too. Just not as much Jan 10 at 1:43

You're missing the fact that those molecules are moving really fast and they're collidingwith each other. Take into accoutn that the can be over $$10^{25}$$ molecules...