Book excerpt: Are you looking to expand your comprehension of refrigeration principles? Are you tired of all of the unnecessary technical jargon by non-operators explaining simplistic concepts? Are you looking for a text that will explain refrigeration in a layman manner that will allow the reader to quickly integrate the material into their understanding and quickly learn how to communicate the content? Then this book and all the books in this series are for you. Studying this book and committing the content to memory will guarantee you success on any license examination you are taking.