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This lecture covers the equilibrium between subsystems, heat and enthalpy, systems at fixed pressure, work and free energy. It explores the balance between subsystems coupled to a reservoir, focusing on the relationships between heat, work, and energy. The lecture delves into the concept of a system coupled to a heat tank, discussing the balance between subsystems and the walls of the tank. It also examines the impact of raincoats on the system and tank, emphasizing the importance of maintaining constant temperature and pressure. The lecture concludes with a detailed analysis of the fixed pressure balance and the minimization of enthalpy in a system. Throughout the lecture, the instructor emphasizes the significance of understanding the physical implications of potentials in thermodynamics.