GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Diffusion of potassium permanganate. A time-lapse series showing potassium permanganate crystals dissolve and diffuse in a water-filled Petri dish. The first 4 photos were taken over 30 min, while the 5th photo was taken after about 11 hours. Photo 1 of 5.
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