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Many chemical reactions take place at the surfaces of solids, e. g. , at the surface of solid catalysts.
Corrosion of metals takes place at their surfaces. Surface means the topmost layer on the very exterior of a solid. Now-a-days, there are ways of studying the top 0.
5 to 2 nm, i. e. , two to five of the topmost layers of atoms of the solid surface.
Adsorption. The existence of a substance at a surface in different concentration than in the adjoining bulk is called adsorption. It is selective absorption.
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