A closed system is one in which
एक बंद प्रणाली वह है जिसमें
Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
A closed system is one in which mass does not cross boundaries of the system, though energy may do so,
Hence, the correct option is (A).
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