The study of physical adsorption has enormous economic and technical value, while continuing to present significant scientific challenges. During the last few years three significant trends have become manifest: significant theoretical advances; instrumental developments allowing detailed characterization of materials, including microporous solids; and the realization that closer coupling of scientific and technological lines of enquiry can lead to both greater scientific understanding and better technology. Topics covered include: the dramatic progress in theoretical analysis; breakthroughs in experimentation; the unique aspects of transport in micropores; and the application of physical adsorption in industrial processes. Audience: Specialized workers will find the updated material invaluable. University lecturers may use material in the book for introductory or graduate courses. The extensive literature references point to further detailed studies.