Who can explain to me how they get the work?

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Discussion Overview

The discussion revolves around calculating the work involved in expanding a gas from a specified initial state to a final state, focusing on the formula W=-PdeltaV. Participants express confusion regarding the application of this formula without additional context about the process or assumptions involved.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant states the formula for work done in gas expansion but expresses confusion about a specific calculation involving pressure and volume.
  • Another participant argues that the work done is path-dependent and questions the ability to provide a definitive answer without knowing how pressure varies with volume during the process.
  • A later reply reiterates the concern about the lack of information regarding the path taken in the expansion, suggesting that the question may not be fully stated.

Areas of Agreement / Disagreement

Participants generally agree that the lack of information about the process makes it difficult to provide a definitive answer. There is no consensus on how to approach the problem due to the path-dependence of work done in gas expansion.

Contextual Notes

Limitations include the absence of details on how pressure changes with volume during the expansion, which is crucial for accurately calculating work. The discussion also hints at potential assumptions that may not have been stated in the original problem.

Song
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Calculate the work involved in expanding a gas from an initial state of 1.00L and 10.0 atm of pressure to 10.0L and 1.0 atm pressure.

I know W=-PdeltaV
but I don't understand how they get w=-(1.00atm)(10.0L-5.00L)

Thanks.
 
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anyone?
 
I don't think anyone answered this because the work done is path-dependent, and with the info you've given, it can't be really "answered". Assumably P is a function of V or V is a function of P, depending on how this process was done.

Then what level course is this (are helpers allowed to mention "integration"?) Do you have any other info on the system or the problem's assumptions?
 
physics girl phd said:
I don't think anyone answered this because the work done is path-dependent, and with the info you've given, it can't be really "answered". Assumably P is a function of V or V is a function of P, depending on how this process was done.

Indeed. You can't answer this question because the path isn't given.

Song, are you sure that's exactly how the question was stated?
 

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