ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Diffusion. Tea dissolving in water in a beaker. Chemicals from the tea leaves, which are held in a perforated bag, diffuse throughout the water forming a solution. Diffusion is caused by the tiny, random movements of molecules in a solution. Over time these movements cause the dissolved substance to become evenly dispersed throughout the solvent, without being stirred.
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