Anesthesia is a practical, clinically based medical science. Its conduct requires Anesthesiologists and Intensivists to learn and understand the principles of applied physics related to equipment responsible for the clinical care of patients. This book is written primarily for anesthetic registrars/residents and their teachers, to assist with preparation for the post graduate, basic science examinations in anesthesia and critical care medicine. Each topic is systematically covered using first principles, contextual examples, and illustrations to explain and demonstrate complex concepts. This comprehensive book is an up-to-date compilation of these scientific principles that can easily be applied to any operating theatre or intensive care unit around the world.