👉 The term "isothermal" refers to a state of uniform temperature within an enclosed system. This concept has applications in various fields such as physics, chemistry, and engineering. It involves maintaining a constant temperature or pressure over a wide range of conditions without any significant change in the internal energy. Isotropy is another key aspect of this definition, where the temperature and pressure are kept constant throughout the entire process. Isothermal systems can be used to study processes such as heat transfer in fluids, chemical reactions