And a freezing or melting point is not related to vigor pressure the same way that boiling points are. By adding a solid or an impurity to a pure substance, we increase entropy and make it difficult to form a crystal structure. Therefore, more energy needs to be taken away from our system. And this means that our freezing and melting point lowers. Now that melt by which our freezing and melting point lowers can be found by a similar formula. The change in temperature is equal to a new constant that depends on the substance being melted or frozen.