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| [[Category:Done 2018-07-20]] | | #REDIRECT [[Isochore (volume)]] |
| [[File:Isochore.png|thumb|500px|right|Figure 1. The [[PV diagram]] of an isochoric process<ref>Image made by Energyeducation team.</ref>]]
| | [[Category:Done 2026-07-01]] |
| <onlyinclude>An '''isochoric''' process in the context of [[thermodynamics]] is a term used to describe a situation where the volume of a [[system]] remains constant.</onlyinclude> This process is modelled on a [[pressure volume diagram]] (PV diagram) as seen in Figure 1. For this process to be possible, the [[ideal gas]] must be in a rigid container that doesn't change in volume or let any [[molecule]]s escape. Then, [[heat]] can be added or removed to change the pressure (and as a result also [[temperature]]) of the system.
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| For [[work]] to be done on the system, a [[force]] which moves it a nonzero distance must be applied. However, due to the system not expanding or compressing it is not 'moving any distance', so the work done during these processes will be ''zero''.<ref>R. Knight, Physics for scientists and engineers. Boston, Mass.: Addison-Wesley, 2012, p. 474</ref> This can be seen visually on the [[pressure]]-[[volume]] diagram (figure 1), as there is no area under the curve (since work is found by calculating the area under the curve).
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| One mechanism that uses the isochoric process is the expulsion of [[heat]] in [[heat engine]]s that use diesel and gasoline. The waste heat is expelled right after the vehicle or machine receives power from [[combustion]], but since the piston is not moving, the volume of the chamber is unchanging and the pressure drops. The process a gasoline engine undergoes is modelled by the [[Otto cycle]] (Figure 2) and diesel engines are modelled by the [[Diesel cycle]] (figure 3). An isochoric process is seen in the expulsion of heat in both process (4 to 1). Moreover, a gasoline engine exhibits an isochoric process during combustion as well (Figure 2, steps 2 to 3).
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| See the page on the [[Otto cycle]] and [[Diesel cycle]] for more information.
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| <gallery caption= "Applications of the Isochore" mode=packed heights=260px>
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| File:P-V_Otto_cycle.png|Figure 2. The PV diagram of the Otto Cycle<ref>Wikimedia Commons [Online], Available: https://en.wikipedia.org/wiki/Otto_cycle#/media/File:P-V_Otto_cycle.svg</ref>
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| File:diesel cycle.jpg|Figure 1. The PV diagram of the Diesel Cycle<ref>"File:Grafico p-v.JPG - Wikimedia Commons", Commons.wikimedia.org, 2018. [Online]. Available: https://commons.wikimedia.org/wiki/File:Grafico_p-v.JPG. [Accessed: 10- Jul- 2018].</ref>
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| </gallery>
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| ==For Further Reading==
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| *[[Pressure volume diagram]]
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| *[[Heat]]
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| *[[Ideal gas law]]
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| *[[Isobar]]
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| *[[Isothermal]]
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| *[[Adiabatic]]
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| *Or explore a [[Special:Random| random page]]
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| ==References==
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| {{reflist}}
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