why we can’t see air

Question

I understand the N2 O2 are very small molecules. But aren’t they all packed down on the earths surface? There’s no vacuum here so all of space on surface level should be filled with N2 C2O and O2

In: Physics

Answer 1

We can see air; it’s blue. That’s why the sky’s blue. That’s why mountains that are far away look blue. You’re seeing the air in between you and the mountain.