The three areas are marked solid, liquid, and vapor. Under a set of conditions in the diagram, a substance can exist in a solid, liquid, or vapor (gas) phase. The labels on the graph represent the stable states of a system in equilibrium.
B. Three Lines (Curves)
B. Three Lines (Curves)
The lines that serve as boundaries between physical states represent the combinations of pressures and temperatures at which two phases can exist in equilibrium. In other words, these lines define phase change points.
B. Three Lines (Curves)
B. Three Lines (Curves)
1. The green line divides the solid and liquid phases, and represents melting (solid to liquid) and freezing (liquid to solid) points.