This book is a comprehensive collection of chemical engineering terms in a single volume. The book is a useful reference material for the people both at the schools and the industry. Our experience of teaching and research over the years has made us to realize a must book of this kind. Better understanding of the terms helps in better understanding the relevant literature and in communicating with more assurance and less use of words. The book is easy to use as the terms are written in an alphabetical order. Where a term deserves more elaboration, a rather detailed description is provided. The book also contains a number of labeled diagrams which are extremely helpful in comprehending some important terms.