The study of physical adsorption has economic and technical value, while continuing to present scientific challenges. During recent 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 in this text include: progress in theoretical analysis; breakthroughs in experimentation; the unique aspects of transport in micropores; and the application of physical absorption in industrial processes. Specialized workers and university lecturers may find material in the book useful for introductory or graduate courses. The literature references point to further detailed studies.