Six facts about diffusion

Diffusion is passive. No energy is transferred for it to take place.

Substances diffuse from a region of high concentration to a region of low concentration. This is called a concentration gradient.

Rate of diffusion is affected by temperature because it affects the way that particles move.

Rate of diffusion is affected by the surface area of membrane available.

Diffusion can be facilitated by membrane proteins.

The diffusion of water is called osmosis.