| Absorption | Adsorption |
|---|---|
| It is the phenomenon in which the particles of gas or liquid get uniformly distributed throughout the body of the solid. | It is the phenomenon of higher concentration of particles of gas or liquid on the surface than in the bulk of the solid. |
| The concentration is the same throughout the material. Therefore, it is a bulk phenomenon. | The concentration on the surface of the adsorbent is different from that in the bulk. Therefore, it is a surface phenomenon. |
| Absorption occurs at uniform rate. | Adsorption is rapid in the beginning and its rate slowly decreases. |
| It is an endothermic process. | It is an exothermic process. |
| Example – anhydrous calcium chloride absorbs water. | Example – silica gel adsorbs water vapours. |
Tuesday 13 March 2018
Absorption Vs Adsorption
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