This book is a clearly written, carefully organized travel through the First and Second Laws of Thermodynamics leading to applications in chemical process equipment and into vapor-liquid, liquid-liquid, and reaction equilibrium. Though the book is focused on material which chemical engineering students need to understand for their upper-level studies, all students will find the development of the First and Second Laws of Thermodynamics very useful material presented in a new light. Detailed problems with full explanations are solved in each chapter of the book. Extensive data in the appendix is useful not only for studies in this book, but also for engineering practice. Applications covered in the book include industrial process equipment such as heat exchangers, compressors and turbines and important cycles such as the steam Rankine cycle, vapor compression cycle, Otto and Diesel engines and others.