What is the term used for the substance that is being adsorbed?

What is meant by adsorbtion?

. What is meant by a substance?

Adsorption is the adhesion[1] of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface.[2] This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent).[3] While adsorption does often precede absorption, which involves the transfer of the absorbate into the volume of the absorbent material, alternatively, adsorption is distinctly a surface phenomenon, wherein the adsorbate does not penetrate through the material surface and into the bulk of the adsorbent.[4] The term sorption encompasses both adsorption and absorption, and desorption is the reverse of sorption.

define with examples of desensitizing agents and protectives & adsorbents

Fill in the Blank QuestionFill in the blank question.A substance that is unlike other substances because it is both reabsorbed and secreted is .