A control volume is
An isolated system
A closed system but heat
and work can cross the boundary
A specific amount of mass in space
A fixed region in space
where mass, heat and work can cross the boundary of that region
A fixed region in space
where mass, heat and work can cross the boundary of that region
A control volume has fixed boundary. Mass, momentum and energy are allowed to cross the boundary. The boundary of the control volume is referred to as control surface.
Hence,
the correct option is (D).
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