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Ideal gas undergoes cycle process

  • Thread starter b_andries
  • Start date
  • #1
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Hi,

An amount of ideal gas undergoes the folowing cycle process in the following graph:

attachment.php?attachmentid=33655&stc=1&d=1301348391.jpg


This process can be presented by the following PV-graph :
attachment.php?attachmentid=33656&stc=1&d=1301348391.jpg


The answer has to be the upper graph but why can't it be the lower graph ?
Thank you!
 

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  • #2
I like Serena
Homework Helper
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An ideal gas has: p V = n R T

That is: V = n R T / p

As you can see in the upper graph there are linear relations between T and p, meaning V must be constant, resulting in vertical lines in the p-V-graph.
Note that the diagonal lines in the upper graph can be extended to intersect the axes at the origin.
 

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