Physical Pharmaceutics bridges the fundamental principles of physical chemistry with the practical formulation, stability, and delivery of pharmaceutical dosage forms. Understanding physical pharmaceutics is indispensable for a pharmacist, enabling the rational design of safe, stable, effective, and reproducible drug products. This expanded edition has been substantially enlarged from the original concise treatment. Every unit now carries fuller derivations shown step-by-step, additional worked numerical examples with unit-consistent answers, expanded comparative tables, clinically and industrially relevant applications, common student misconceptions flagged explicitly, and unit-end review question banks (short answer, long answer, and numerical) suitable for internal assessment and university examination preparation. New subsections have been added throughout wherever the original treatment was compressed, including expanded coverage of solubility parameter theory, cosolvency, additional surfactant classification, rheological instrumentation, and industrial powder characterization.