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diffusion

World Encyclopedia | Date: 2005

diffusion Movement of a substance in a mixture from regions of high concentration to regions of low concentration, due to the random motion of individual atoms or molecules. It is used to separate the isotopes of uranium to produce enriched fuel for fast nuclear reactors. Diffusion ceases when there is no longer a concentration gradient. Its rate increases with temperature, since average molecular speed also increases with temperature.

Â© World Encyclopedia 2005, originally published by Oxford University Press 2005.

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