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This lecture covers the thermodynamics of irreversible processes, focusing on Onsager-Casimir reciprocity relations, linear phenomenological relationships, and chemical reactions. It explains the linear scalar and vectorial relations, the evolution of irreversible thermodynamic processes, and the coupling of chemical reactions. The lecture also delves into internal friction, the Onsager matrices, and the second law of thermodynamics. Practical examples include the thermal diffusion in a bar and the thermal phase shift experiment on a copper rod.