Preface to the Sixth Edition

The author is highly thankful to the readers for the warm welcome given to the previous editions of this book and sending their appreciation and suggestions. As far as possible suggestions received from readers have been considered and relevant additions have been incorporated. The present edition has been made comprehensive for increasing its utility to the students.

Most of the chapters have been reinforced with additional materials wherever considered necessary. As per the suggestions by readers, the chapter on “Energy Conservation” is added.

Some more solved and unsolved problems are added after the relevant articles, for better understanding and use of the articles.

Suggestions for the further improvement in the book will be gratefully acknowledged.