What is diffusion? ?

Diffusion is the process by which molecules or particles spread out evenly from an area of high concentration to an area of low concentration. This movement occurs due to the random motion of particles and does not require any external energy input. Diffusion is a fundamental process in various biological, chemical, and physical systems.

Diffusion is the net movement of molecules from a region of high concentration to a region of low concentration. This movement is driven by the random motion of molecules and occurs in all three states of matter (solid, liquid, and gas). The rate of diffusion is proportional to the concentration gradient (the difference in concentration between the two regions) and the temperature.