You want to measure the effectiveness of a porous solid desiccant. To do so, you attach a
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You want to measure the effectiveness of a porous solid desiccant. To do so, you attach a slab of the desiccant 0.5 × 20 × 20 cm to a thin wire. You then attach the wire to an analytical balance and suspend the slab in a chamber at 45°C and twenty percent relative humidity. You find that the slab weight varies with time as follows:
Find the permeability of water vapor in this desiccant. You will find that the data fit neither a finite slab nor an infinite slab. One good alternative model is to postulate pores in the slab.
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