The correct design and manufacturing of highly efficient condensing systems is currently hampered by an insufficient understanding of the condensation phenomena, both in its fundamental and application-related aspects. This book is a unique attempt by the author, well-known in the U.S., Japan and Europe, to present theoretical aspects of laminar film condensation. Numerical mathematical analysis of the similarity solution of the vapor-liquid two-phase boundary layer equations are given and the results are formulated in such a manner that their importance is emphasized to both theoreticians and practitioners. The book is of interest to the scientific community dealing in heat transfer (both engineers and physicists), as well as to applied mathematicians. Each chapter contains new treatments and new findings. The figures and tables presented will be useful for an intuitive grasp of the characteristics of film condensation and for further improvement in theoretical studies. The formulated results will contribute to the research and development in condenser design. The physical property data used in this book are listed in the appendix.