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(C) An isochoric process is a thermodynamic process in which the volume $(V)$ of the system remains constant.In a $P-V$ diagram,a constant volume proc

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$C$

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(C) An isochoric process is a thermodynamic process in which the volume $(V)$ of the system remains constant.In a $P-V$ diagram,a constant volume process is represented by a vertical line,because for a single value of $V$,the pressure $(P)$ can vary.Looking at the given options:Graph $(A)$ shows $P$ proportional to $V$.Graph $(B)$ shows constant pressure (isobaric).Graph $(C)$ shows a vertical line,which indicates that $V$ is constant while $P$ changes.Graph $(D)$ shows a curve.Therefore,graph $(C)$ represents an isochoric process.

Which of the following graphs between pressure $(P)$ and volume $(V)$ correctly shows isochoric changes?

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