There are many properties of matter which are related to their surface. These surface properties become predominant when the material is present in finely divided form or if its surface is rough. Under these conditions, surface area of the material increases enormously and large amount of substance is present at the surface. The science which deals with the properties and identities of a substance that are related to their surface is called surface chemistry. Adsorption and absorption are the two main topics which are widely discussed under the surface chemistry. Let’s have a look at the difference between adsorption and absorption:
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Adsorption |
Absorption |
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It involves unequal distribution of the molecular species in bulk and at the surface. |
It involves uniform distribution of the molecular species throughout the bulk. |
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It is rapid in the beginning and slows down near the equilibrium. |
It occurs at uniform rate. |
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It is a surface phenomenon. |
It occurs throughout the body of material. |
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