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phys: clarify pv graph

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eggy 2021-01-15 17:36:03 -05:00
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@ -610,7 +610,7 @@ $$pV=nRT$$
- An **isobaric**, **isothermal**, or **isochloric**/**isovolumetric** process have a constant pressure, temperature, or volume, respectively. - An **isobaric**, **isothermal**, or **isochloric**/**isovolumetric** process have a constant pressure, temperature, or volume, respectively.
- A **thermodynamic process** induces a change in a gas's temperature, pressure, or volume. - A **thermodynamic process** induces a change in a gas's temperature, pressure, or volume.
A **thermodynamic cycle** consists of thermodynamic processes that return a gas to its initial state, and appear in pressure-volume graphs as closed shapes. In such a cycle, the work done is equal to the pressure and change in volume: A **thermodynamic cycle** consists of thermodynamic processes that return a gas to its initial state, and appear in pressure-volume graphs as closed shapes. In such a cycle, the work done **on the gas** is equal to the pressure and change in volume:
$$W=p\Delta V$$ $$W=p\Delta V$$
If the pressure is not constant, the work done is instead the area under the graph in that process. If the pressure is not constant, the work done is instead the area under the graph in that process.