The Books on Heat and Mass Transfer, generally available in the market, are of two types one, those are very good as regards fundamentals and concepts with very little emphasis on the art of problem solving, and the other, which present a huge lot of problems without much concern for basics and logic. The dual objective of understanding of the physical phenomena involved and the ability to formulate and solve typical problems in the field by an average student has been kept in mind while writing this text. The subject matter has been developed in a logical and coherent matter with neat illustrations along with a fairly large number of solved examples and unsolved problems. Answers to all unsolved numerical problems are given.