molecular diffusion

Molecular diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration. Imagine adding a drop of food coloring to a glass of water: the color gradually spreads out until it is evenly distributed. This happens because molecules are constantly moving and colliding with each other, causing them to disperse. Diffusion occurs in gases, liquids, and even solids, and is driven by the natural tendency of substances to balance out concentrations. It plays a crucial role in many natural processes, including respiration and the movement of nutrients in cells.