“I recommend the book for anyone working in an energy related field who would like to get a better understanding of another part of the field or the subject of energy as a whole. Working engineers who would like a reference that crosses subject boundaries and collects important information about many of them in one place will find this book a useful reference. Educated readers who may not care about the equations presented, but still want a somewhat in-depth look at the subject of energy in its various forms and the problems faced to provide it can still get a good general understanding of the various forms of energy from this book. Students of any engineering or science discipline, who would like a good understanding of the various forms of energy, their production, and use, will find this book easily readable and immediately useful. --Saeid Mokhatab, Advisor of Natural Gas Engineering Research Projects, Chemical & Petroleum Engineering Department, University of Wyoming, Laramie, Wyoming, USA