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Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration. This occurs when particles are free to move, and it is commonly observed in gases and particles dissolved in solutions. Diffusion follows a concentration gradient, meaning particles naturally move toward areas where their concentration is lower. There are many everyday examples of diffusion. For example, we can smell perfume because its particles diffuse through the air and reach our noses. Similarly, when a teabag is placed in hot water, the tea diffuses into the water. Other examples include cigarette smoke spreading into the air.
