Isolated System

An isolated system is a concept in physics where no energy or matter can enter or leave the system. It’s like a perfectly sealed container that doesn’t allow anything to escape or be added. This means the total energy and mass inside remains constant over time. In reality, perfect isolated systems are idealizations, but they are useful for understanding scientific laws, such as the conservation of energy. Examples include a thermos bottle preventing heat exchange or a hypothetical universe with no interaction with anything outside it.