We would like to sketch several processes on the p$-$u and T$-$u vapor dome diagrams.

a$.$ Superheated vapor is cooled at constant pressure until liquid just begins to form.

b$.$ The superheated vapor from part $($a$)$ is cooled at constant pressure until it is a subcooled $($compressed$)$ liquid.

c$.$ A liquid$-$vapor mixture with a quality of $60$ percent is heated at constant volume until its quality is $100$ percent.

d$.$ A liquid$-$vapor mixture with a quality of $60$ percent is heated at constant volume until it attains a pressure equal to the critical pressure.