This encyclopaedia offers a comprehensive and scholarly treatment of chemical physics and physical chemistry, integrating fundamental theory with applied scientific understanding. It explains the physical principles governing matter, energy, and molecular behaviour, linking quantum concepts with chemical structure and reactivity. The discussion covers atomic and molecular interactions, dynamic processes, and the physical basis of chemical change. Emphasis is placed on radiation–matter interactions, reaction mechanisms, and the physicochemical properties of complex substances. The encyclopaedia also examines polymer systems from a physical chemistry perspective, addressing structure, characterisation, stability, and functional behaviour under varying physical conditions. Thermodynamic principles are explored in depth, including equilibrium and non-equilibrium systems, statistical interpretation, and thermal analysis. By combining mathematical formulations with experimental interpretation, the work provides a unified framework for understanding how physical laws govern chemical systems across scales. It supports conceptual clarity while encouraging analytical thinking in advanced scientific study and research.

It is intended for postgraduate students, researchers, and academics in physics, chemistry, and materials science. The encyclopaedia serves as an authoritative academic reference for advanced learning, interdisciplinary research, and the interpretation of experimental and theoretical studies in modern physical and chemical sciences.