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Chapter: Engineering Chemistry: Surface Chemistry and Catalysis

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Adsorption and Absorption

The phenomenon of adsorption is different from that of absorption.

Adsorption and Absorption

The phenomenon of adsorption is different from that of absorption. The latter term implies that a substance is uniformly distributed throughout the body of a solid, Fig. 17.2(b). If we leave a small lump of calcium chloride in open, it absorbs water vapour (moisture) from air and after some time even starts dissolving in it. On the other hand if we keep a sample of silica gel in open, it adsorbs water vapour on its surface as shown in Fig. 17.2 (a).

 


 

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