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A PV diagram plots the change in pressure P with respect to volume V for some process or processes. Typically in thermodynamics, the set of processes forms a cycle, so that upon completion of the cycle there has been no net change in state of the system; i.e. the device returns to the starting pressure and volume.
This Process Path is a straight horizontal line from state one to state two on a P-V diagram. Figure 2. It is often valuable to calculate the work done in a process. The work done in a process is the area beneath the process path on a P-V diagram. Figure 2 If the process is isobaric, then the work done on the piston is easily calculated.
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Because the net variation in state properties during a thermodynamic cycle is zero, it forms a closed loop on a P-V diagram. A P-V diagram's abscissa, Y axis, shows pressure (P) and ordinate, X axis, shows volume (V). The area enclosed by the loop is the net work done by the processes, i.e. the cycle:
English: A cyclic thermodynamic process described on a pressure-volume diagram. A and C are constant-pressure (isobar) evolutions, B and D are constant-volume (isochoric) evolutions. A and C are constant-pressure (isobar) evolutions, B and D are constant-volume (isochoric) evolutions.
p–V diagram for the ideal Diesel cycle.The cycle follows the numbers 1–4 in clockwise direction. The image shows a p–V diagram for the ideal Diesel cycle; where is pressure and V the volume or the specific volume if the process is placed on a unit mass basis.
The file size of this SVG diagram may be irrationally large because its text has been converted to ... volume (p-V) diagram of the Carnot cycle: 10:45, 3 April 2006:
p–v–T 3D diagram for fixed amount of pure material. It is possible to envision three-dimensional (3D) graphs showing three thermodynamic quantities. [12] [13] For example, for a single component, a 3D Cartesian coordinate type graph can show temperature (T) on one axis, pressure (p) on a second axis, and specific volume (v) on a third.