Physical chemistry is an interdisciplinary field integrating the principles of physics and chemistry. Physical chemistry focuses on understanding the physical properties of atoms and molecules. It involves analyzing materials to discovering the potential use of the materials. Physical chemistry requires the use of analytical instruments like lasers, electron microscopes, mass spectrometers, etc. This book discusses the fundamentals as well as modern approaches of physical chemistry to help develop a comprehensive understanding of this field. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included in this book. It is appropriate for students seeking detailed information in physical chemistry as well as for experts.