Summer ☀️ is here, and so we’re back with our reading club at the Saale river! In this session, we dive into the fascinating world of entropy—a concept that lies at the heart of thermodynamics and statistical mechanics. A deeper understanding of entropy emerged through the work of Max Planck, who applied the ideas of Ludwig Boltzmann to light. This connection helped reveal the microscopic foundations of entropy through the quantization of energy. In our reading, we explore the shelf model by Arnd H. Jungermann to develop an intuitive understanding of the relationship between entropy and other fundamental concepts such as energy, heat, and temperature.