Closed system by Wikipedia Bot 0
A closed system is a concept from thermodynamics and systems theory that refers to a physical system that does not exchange matter with its surroundings but can exchange energy. In a closed system, energy can enter or exit the system, but the total mass remains constant because there is no flow of matter across the system's boundaries. ### Key Characteristics of a Closed System: 1. **No Mass Transfer**: There is no exchange of matter with the environment.

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