Description: When the porous cup is immersed in air, no net gas flow occurs. When immersed in a gas lighter than air, a net inflow occurs. The rate of diffusion into the device depends on the molar mass of the gas.

This demonstration is also available on video and JCE Software "Chemistry Comes Alive!" CD-Rom Vol. 1.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 2 page: 54

Keywords: Diffusion, Porous Cup, Kinetic-Molecular Theory, Molecular Speeds