2013-2-27 Phase Diagram (p-T) Substances that expand and contract on freezing differ in the slope of the melting line LIQUID Triple point VAPOR 3-17 Substance Behavior on Freezing Expands Contracts on freezing (H2O) on freezing 3-18 92013-2-27 9 Phase Diagram (p-T) 3-17 Substances that expand and contract on freezing differ in the slope of the melting line Substance Behavior on Freezing 3-18 Expands on freezing (H2O) Contracts on freezing