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In the Biophysics course covering viscosity and surface phenomena, students explore the critical physical principles governing fluid behavior and surface interactions within biological systems. The viscosity chapter examines how internal friction within fluids (described by dynamic and kinematic viscosity) affects the flow of biological fluids like blood and cytoplasm, influencing cellular and systemic functions. The surface phenomenon chapter delves into surface tension, exploring how intermolecular forces at interfaces impact processes such as drop formation, capillary action, and the behavior of liquid interfaces. Key concepts include Laplace's law for pressure differences in droplets and bubbles, Jurin's law for capillary rise, and the role of surface and interfacial tensions in biological and physiological contexts. Together, these chapters provide a comprehensive understanding of how physical forces shape biological processes at both the microscopic and macroscopic levels.