Heat Transfer is a compulsory core course in the curriculum of almost all branches of engineering in several Engineering and Technical institutions and universities. An outcome of the lecture notes prepared by the author, this book has been prepared primarily for an introductory course in Heat & Mass Transfer. Particular emphasis has been placed on precise and logical presentation of the concepts and principles. The traditional, classical approach has been adopted in presenting the subject matter. Every chapter has a set of learning objectives, a chapter summary, and several review questions. Finally, every chapter closes with a set of unsolved problems with answers at the end of the book. Several solved problems are included throughout.