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Absorption is the sucking in of substances, like water into sponge. 

Adsorption is the accumulation of substances on the surface of another, without going inside.
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i) The concentration of solute is uniform distributed all over the surface.
  Eg., cotton dipped in ink is blue throughout.            
It is a bulk phenomenon.

i) The concentration of substance is more on surface and less in the bulk.
Eg., chalk dipped in ink is blue on the surface and white in bulk.
It is a surface phenomenon.

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