Diffusion of blue dye in an agar gel

Diffusion of blue dye in an agar gel

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Diffusion. Methylene blue dye diffusing through agar gel in a test tube. A sample of the dye was placed in a thin layer half way down the tube. The dye has started to dissolve into the agar and permeate throughout the tube. Diffusion occurs because all molecules have motion due their heat energy. Each molecule moves in a random direction, meaning that there will be a net movement of dye molecules from areas of high concentration (the central band) into areas of low concentration (the agar). The rate of diffusion depends upon the nature of the substances involved, and their temperature. Photographed one week after the experiment was begun.

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Keywords: agar, diffusing in agar, diffusion, dissolving, dye, dye diffusion, dye in agar, effects, liquid, methylene dye, physical effect, physics

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