The escape of molecules from the surface of a liquid is known as ____. Condensation boiling evaporation sublimation 6. The direct change of a substance from a solid to a gas is called ____. Evaporation sublimation condensation solidification 7. How are conditions of pressure and temperature, at which two phases coexist in equilibrium, shown on a phase diagram? By a line separating the phases by the endpoints of the line segment separating the phases by the planar regions between lines in the diagram by a triple point on the diagram