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English: PV-diagram for an ideal gas undergoing an isobaric (constant pressure) process. The area under the curve (in red) is the work done by the gas. The area under the curve (in red) is the work done by the gas.
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
In thermodynamics, an isobaric process is a type of thermodynamic process in which the pressure of the system stays constant: ΔP = 0. The heat transferred to the system does work, but also changes the internal energy (U) of the system. This article uses the physics sign convention for work, where positive work is work done by the system.
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.
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.
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Example of a real system modelled by an idealized process: PV and TS diagrams of a Brayton cycle mapped to actual processes of a gas turbine engine Thermodynamic cycles may be used to model real devices and systems, typically by making a series of assumptions to reduce the problem to a more manageable form. [ 2 ]