reversible processes

A reversible process is a change in a system that can be completely reversed without any loss of energy or changes to the surroundings. In ideal conditions, both the system and environment return to their original states after the process. This means no entropy or disorder increases, making the process perfectly efficient. While real-world processes are usually irreversible due to factors like friction or waste, reversible processes are useful as ideal models to understand the maximum efficiency of energy transformations. They serve as a benchmark for designing more practical, real-world systems.