Final answer:
The phase change from point A to B on the phase diagram would be condensation, as point A is evaporation and point B is condensation in the related context, indicating a transition from a gas to a liquid.
Step-by-step explanation:
When analyzing a phase diagram and identifying the phase change that occurs when going from point A to point B, it is important to refer to the descriptions of various phase changes. Phase changes involving a transition to a more energetic state include melting where a solid turns into a liquid, vaporization where a liquid turns into a gas (which also includes boiling and evaporation), and sublimation where a solid directly turns into a gas.
On the other hand, phase changes to a less energetic state include condensation (gas to liquid) and freezing (liquid to solid). As the specific details from point A to point B on the phase diagram are not provided, one cannot definitively determine whether the phase change is melting, freezing, condensation, or vaporization. However, using the information provided and the knowledge that point A is evaporation and point B is condensation, following the context clues and descriptions, one can infer that the phase change from A to B would be condensation, which involves the transition from gas to liquid.