This book mainly aims in guiding the teachers and students, the fundamental principles of Pharmaceutical Engineering. This book helps the students in overcoming the obstacles faced by them in understanding the aspects of Pharmaceutical Engineering. Topics, which usually confuse the students, are explained along with applications to broaden their mental horizon regarding the subject. This book is meant to serve as an introductory text for undergraduate students doing Bachelor of Pharmaceutical Sciences (B. Pharm). It will also prove useful to people working in pharmaceutical and allied industries. In keeping with its initiatory approach to pharmaceutical engineering, only the important aspects of the subject have been discussed in a simple and easily comprehensible manner.