Final answer:
At point C on the PV diagram, the process shown is an isochoric (or isovolumetric) process. It occurs when the volume of the system remains constant while the pressure changes. This process is important in thermodynamics as it helps analyze the behavior of gases and the relationship between pressure, volume, and temperature.
Step-by-step explanation:
At point C on the PV diagram, the process shown is an isochoric (or isovolumetric) process. This process occurs when the volume of the system remains constant while the pressure changes. In an isochoric process, work is not done because there is no change in volume, so the area under the curve representing the process on the PV diagram is zero.
It occurs because at point C, the system is being heated, causing the pressure to increase without any change in volume. This can happen, for example, when a gas inside a container is heated with a constant volume. As a result, the temperature of the system increases, leading to an increase in pressure.
This is an important process to understand in thermodynamics as it allows us to analyze the behavior of gases and the relationship between pressure, volume, and temperature.