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In this question a have to draw a F/A diagram in function of p-V (pressure-volume) diagram below. enter image description here

I think in a intuitive way that this graphic of F/A it´s going to be the same graphic because Pressure it´s equal to Force and Volume it´s proportional to Area.

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    $\begingroup$ Here, from a) volume seems proportional to length and Area seems to be independent $\endgroup$ Jan 27 '16 at 5:53
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    $\begingroup$ Force is not equal to Pressure. It is proportional to Pressure. $\endgroup$
    – user104909
    Jan 28 '16 at 8:43
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I think in a intuitive way that this graphic of F/A it´s going to be the same graphic because Pressure it´s equal to Force and Volume it´s proportional to Area.

The pressure $p$ left of the piston exerts a force $F$ on the piston with cross-section $A$:

$$F=pA$$

So:

$$p=\frac FA$$

A graph for (a) of $\frac FA$ v. volume $V$ will indeed be similarly shaped as for (b), assuming (b) is indeed a $p,V$ diagram.

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