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This lecture covers the concepts of entropy, temperature, and pressure, as well as various experiments related to these principles, such as gas thermometers, estimation of absolute zero, shock waves, Magdeburg hemispheres, and vacuum cannons. It also explores the equivalence between work and heat using examples like the Joule calorimeter. The instructor demonstrates the symmetries and irreversibilities in harmonic oscillators and discusses the relationship between work, heat, and temperature changes. The lecture concludes with a study on the production of entropy in adiabatically closed systems. Through practical experiments and theoretical explanations, students gain a deeper understanding of the fundamental principles of thermodynamics.