Definition of a closed thermodynamical system.

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SUMMARY

A closed thermodynamical system is defined as one where no mass is transferred across its boundaries, while heat and work can be exchanged. The discussion clarifies that multiple components, such as two balloons of gas, can collectively form a closed system as long as they do not allow mass transfer across their combined boundaries. Therefore, a closed system can indeed consist of separate parts, provided that the total mass remains constant within the defined boundaries.

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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 balloon 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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