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Definition of Diffusion rate (rate of diffusion)

Diffusion rate (rate of diffusion) Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
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Compare with effusion .The number of randomly moving molecules that pass through a unit area per second. Diffusion rates are fastest when a large concentration difference exists on either side of the unit area. Diffusion rates increase with temperature, and decrease with increasing pressure, molecular weight, and molecular size.