Engineering Thermodynamics
A closed system is one in which

Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is not dependent on the path followed but on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Is dependent on the path followed and not on the state
Depends on the mass of the system like volume

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