Saturation vapor curve

The saturation vapor curve is the curve separating the two-phase state and the superheated vapor state in the T–s diagram (temperature–entropy diagram). The saturation vapor curve is the curve separating the two-phase state and the superheated vapor state in the T–s diagram (temperature–entropy diagram). The saturated liquid curve is the curve separating the subcooled liquid state and the two-phase state in the T–s diagram. When used in a power cycle, the fluid expansion depends strongly on the nature of this saturation curve: