Description: Lentils and beans are used to represent molecules of two different sizes. The screen between them is small enough only to let the lentils through to the other side. Initially the “fluid” levels are equal. Shaking the container mixes the two “molecules” together. Soon, the “fluid” levels are different on the two sides of the screen.

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Source: Journal of Chemical Education - Vol. 76

Year or vol: 1999 page: 64

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