Discussion
The system in which mass of working substance crosses the boundary of the system is called:
Answer: A
Such a system is an open system.
In an open system, also called a control volume, both mass and energy cross the boundary. Turbines, compressors, pumps and nozzles are examples.
A closed system allows energy but not mass to cross, an isolated system allows neither, and adiabatic describes a process with no heat transfer, not a kind of boundary for mass.
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