Look at the region from C to B.
- Why is the pressure constant here while the volume of the gas is decreasing?
- Is it the phase where gas to liquid transition is going on?
What I know
In the region from A to B, as the pressure increases the volume of the gas reduces.
At C, the state of matter completely changes to liquid and how much ever the pressure increases it will remain in the liquid state.
When the temperature is beyond the critical temperature the change in states of matter does not occur.
The pressure and volume corresponding to the critical temperature is critical pressure and critical volume respectively.
I don't know exactly what is happening in between point C and B?