Definition of a closed thermodynamical system.

In summary, a closed system is defined as having no mass transfer in or out of its boundaries, allowing for the exchange of heat and work. This means that a closed system can consist of separate parts, such as two balloons of gas, as long as there is no mass transfer between them. Therefore, a closed system can have more than one boundary.
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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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1. What is a closed thermodynamical system?

A closed thermodynamical system is a system that does not exchange matter with its surroundings, but can exchange energy through heat or work.

2. How is a closed thermodynamical system different from an open system?

A closed thermodynamical system does not allow matter to enter or leave the system, while an open system allows for the exchange of both matter and energy with its surroundings.

3. Can a closed thermodynamical system reach a state of equilibrium?

Yes, a closed thermodynamical system can reach a state of equilibrium where there is no further exchange of energy occurring.

4. What are some examples of closed thermodynamical systems?

A sealed bottle of soda, a pressure cooker, and a planet are all examples of closed thermodynamical systems.

5. How does the first law of thermodynamics apply to a closed thermodynamical system?

The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted. In a closed thermodynamical system, the total energy remains constant, but it can change forms through heat or work.

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