Diffusion - Wikipedia Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) generally from a region of higher concentration to a region of lower concentration Diffusion is driven by a gradient in Gibbs free energy or chemical potential
Diffusion | Definition Examples | Britannica Diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration A familiar example is the perfume of a flower that quickly permeates the still air of a room