While we keep on compressing by decreasing the volume (path F-G,) the pressure of the system remains constant this condition continues until all the vapor has become liquid. Once we reach the two-phase condition, what happens is not intuitive. We have come to the two-phase condition, where liquid (L) and vapor (V) co-exist in equilibrium, for the first time, albeit an infinitesimal amount of liquid. If we keep compressing isothermally, we will end up at point F, where the gas will be saturated and the first droplet of liquid will appear. Starting at E (all-vapor condition), an increase in pressure will result in a rather significant reduction in volume since the gas phase is compressible. In this case temperature is being held constant our substance is undergoing an isothermal compression process. Figure 3.4: P-v Diagram For A Pure Component
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