Definition of a closed thermodynamical system.

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A closed thermodynamic system can consist of separate parts, as long as the total mass remains constant within the system boundaries. For example, two balloons filled with gas can be considered a closed system if they do not exchange mass with the environment, even though they are distinct entities. The key aspect of a closed system is that while mass cannot enter or leave, heat and work can still be exchanged across the boundaries. Therefore, multiple boundaries can exist within a closed system, as long as the overall mass remains unchanged. This understanding allows for more complex configurations in thermodynamic analysis.
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Wikipedia states the following definition of a closed, thermodynamical system:

"In a closed system, no mass may be transferred in or out of the system boundaries. The system always contains the same amount of matter, but heat and work can be exchanged across the boundary of the system."

QUESTION: Can a closed system consist of separate parts? I.e. consider two baloons of gass, as a n approximation one baloon can certainly be considered as a system. But what if we consider the two baloons together -- would that also be a closed system?

In other words, is a closed system allowed to have more that one boundary?
 
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