Physical chemists study the physical properties and chemical compositions of substances, and analyze why certain materials react or behave the way they do. Physical chemistry is the branch of chemistry that deals with the physical structure of chemical compounds and they way they react when they come in contact with other compounds, the energy they possess and the bonds that hold their atoms together. It is a macroscopic or supra-molecular science that uses the principles and concepts of physics to understand chemical systems. Physical chemists work at the atomic and molecular level of materials—solid, liquid or gas—to discover and understand their fundamental characteristics. They basically work in laboratories, and work with sophisticated equipment, complex instruments and state-of-the-art computers to analyze various materials and develop theories. The results of such research are used to discover new uses for materials in industry-specific applications. Physical chemists work in government agencies, academics, plastic industry, pharmaceuticals, research institutions, etc. The field of physical chemistry is an interdisciplinary one; nanoscale science, analytical chemistry, and molecular modeling are related areas. Read on to browse through a list of world famous physical chemists and read their biographies and timelines.