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Explain how Fick

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Chemistry

Explain how Fick

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1 Portable vapor diffusion coefficient meter Sciencegov United States An apparatus for measuring the effective vapor diffusioncoefficient of a test vapor diffusing through a sample of porous media contained within a test chamber A chemical sensor measures the timevarying concentration of vaporthat has diffused a known distance through the porous media A data processor contained within the apparatus compares the measured sensor data with analytical predictions of the response curve based on the transientdiffusion equation using Ficks Law iterating on the choice of an effective vapor diffusion coefficient until the difference between the predicted and measured curves is minimized Optionally a purge fluid can forced through the porous media permitting the apparatus to also measure a gasphase permeability The apparatus can be made lightweight selfpowered and portable for use in the field Ho Clifford K Albuquerque NM 20070612 2 Review of enhanced vapor diffusion in porous media Energy Technology Data Exchange ETDEWEB Vapor diffusion in porous media in the presence of its own liquid has often been treated similar to gas diffusion The gas diffusion rate in porous media is much lower than in free space due to the presence of the porous medium and any liquid present However enhanced vapor diffusion has also been postulated such that the diffusion rate may approach freespace values Existing data and models for enhanced vapor diffusion including those in TOUGH2 are reviewed in this paper Webb SW Ho CK 19980801 3 Review of enhanced vapor diffusion in porous media International Nuclear Information System INIS Vapor diffusion in porous media in the    See Answer
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