This document discusses three topics related to surface and interfacial tension: solubilization, detergency, and adsorption at solid interfaces. Solubilization is the process of increasing the solubility of organic compounds in water using surfactants. Detergency is the removal of dirt from surfaces using detergents, which are surfactants. Adsorption at solid interfaces is when substances deposit on the surface of solids, with the deposited substance called the adsorbate and the surface called the adsorbent. Adsorption depends on factors like the nature of the adsorbent and adsorbate, temperature, and can be physical or chemical in nature.