what is diffusion

Diffusion is the process by which particles (such as molecules, ions, or atoms) move from an area of high concentration to an area of low concentration, resulting in the uniform distribution of the particles throughout the medium. This process occurs spontaneously and does not require any external energy input. Diffusion is an essential process in many biological and physical systems, including the exchange of gases in the lungs, the movement of nutrients across cell membranes, and the dispersion of pollutants in the atmosphere