Linear Phenomenological Relations

This lecture covers linear phenomenological relations in thermodynamics, focusing on the concept of current densities and generalized forces. It explains the linear relationships between current densities and forces, emphasizing equilibrium conditions and the development of these functions through Taylor series. The lecture also introduces the linear relations between current densities and generalized forces, highlighting the coefficients of these relations and the principle of Curie. Additionally, it discusses the reciprocity relations of Onsager, demonstrating the symmetry of phenomenological coefficients and the implications of microscopic reversibility. The presentation concludes with the mixing of simple and isotropic fluid substances, providing insights into scalar and vectorial current densities and forces.