why can diffusion take place in gases?

Question

I know how it can in liquids, but gases? Help!

Answer 1

Because of the space between the molecules.

Not only are the molecules at higher energy state as a gas, but because there's more space between molecules, it's easier for them to move around.

Answer 2

Diffusion is the movement of particles from higher chemical potential to lower chemical potential (chemical potential can in most cases of diffusion be represented by a change in concentration). It is a physical process rather than a chemical reaction, which requires no net energy expenditure.

Substances diffuse from regions of higher concentration to regions of lower concentration, they are going from a state of higher order to a state of lower order, in accordance with the Second Law of Thermodynamics. Therefore, diffusion is a spontaneous, natural process, and to reverse diffusion would require the expenditure of energy to counteract the higher order of the system and prevent a violation of the laws of entropy.

Answer 3

Diffusion is like when your mom cooks bacon and the smell is diffused throughout your whole house.
Small bits of oil that get cooked off the meat enter the air. Near the stove, they are most concentrated, As the air in your house moves, as it always will, the particles of oil get moved to all parts of the house.