When a fluid undergoes a thermodynamic process in a fixed enclosed space such that the process occurs at constant volume, then the process is called constant volume process or isochoric process. Let us consider heating of a gas in fixed enclosure at constant volume. On p–V diagram this process is represented by a vertical line as shown in Fig. Area under the process line is zero which indicates that there is rise in pressure but there is no work done as there is no change in volume
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