Eventually our solvent will become our impurity. Because if we add enough solute, the amount of solute will surpass the amount of solvent. And when that happens, adding an immortal solute will actually make our freezing point rise and our melting point rise. The fourth Caligra property is called astronomic pressure. Asthmatic pressure is a tendency of water or some other solvent to flow into an area with a higher solute concentration. Now, to demonstrate as much like pressure, let's build a system.