A closed vessel contains water, oil and air at room temp. If the system is synthesized by first adding the water and then layering the oil on the…

A closed vessel contains water, oil and air at room temp. If the system is synthesized by first adding the water and then layering the oil on the water. Is this system a simple or composite system. If composite, define each simple sub-system and the internal restraint. If the vessel is shaken vigorously. Is the system then a simple or composite system?