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Answer: An open system can exchange both matter and energy with the surroundings. Î´ H is measured when an open system is used as a calorimeter. A closed system has a fixed amount of matter, but it can exchange energy with the surroundings.
A closed system is a physical system that does not allow certain types of transfers in or out of the system. The specification of what types of transfers are excluded varies in the closed systems of physics, chemistry or engineering.