Engineering Thermodynamics
A closed system is one in which

Both energy and mass cross the boundaries of the system
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

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Engineering Thermodynamics
Extensive property of a system is one whose value

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

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