Which process involves the transformation of liquid water into vapor?

The process that involves the transformation of liquid water into vapor is known as evaporation. During evaporation, molecules at the surface of the water gain energy and transition into the gas phase, becoming water vapor. This process is commonly observed when water is heated; for instance, when a pot of water is boiled, you can see steam rising as the water converts from liquid to gas.

While condensation refers to the process of water vapor cooling and changing back into liquid form, precipitation involves any form of water that falls from the atmosphere, such as rain, snow, or sleet. Transpiration is the release of water vapor from plants into the atmosphere. Understanding these definitions helps clarify why evaporation is the correct answer in this context, as it specifically addresses the change from liquid to vapor.