Verify Thermochemistry answer (no calculations)

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SUMMARY

The discussion centers on identifying the type of thermodynamic system represented by hot coffee in a vacuum flask. Participants concluded that the system is isolated when the lid is tightly closed, as there is no mass or energy transfer with the surroundings. If the lid is off, the system becomes open due to interaction with the environment. The consensus is that a closed system is not applicable in this scenario, as it allows for energy transfer, which does not occur in a properly sealed vacuum flask.

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  • Understanding of thermodynamic system classifications: open, closed, and isolated systems
  • Basic knowledge of heat transfer principles
  • Familiarity with vacuum insulation technology
  • Concept of system boundaries in thermodynamics
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This discussion is beneficial for students studying thermodynamics, educators teaching the subject, and anyone interested in understanding the principles of heat transfer and system classifications in physics.

ace123
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I just want to make sure my logic is correct.

Hot coffee in a vacuum flask (thermos) is an example of what type of sytem?

Choices:

Closed
Open
Isolated


I thought it was closed system because the coffee is not interacting with the surroundings. But one of my classmates said he thought it was open because it's interacting with the flask. So which one of is correct?

Edit: I know believe it's isolated because heat is not exchanged. at least I don't think it is
 
Last edited:
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heres my .02 (too much fun to stay away :) )

open or closed? depends on if the lid is on and tightened on the flask

the system is the coffee, the flask (and its vacuum ) is the boundary, the surroundings is the rest of the universe outside of the flask.

open if the lid is not on
closed and isolated if it is on and closed tight
 
Yea we don't have that much information. But apparently it was isolated because heat it not transfered. So thank you for your .02 :smile:
 
Definitely isolated - no mass transfer and no energy transfer.
 

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