Final answer:
Water vapor turns back into its liquid form when it cools down, a process known as condensation. High pressure can also induce this transformation. Condensation, paired with evaporation, plays a critical role in the water cycle.
Step-by-step explanation:
Conditions for Water Vapor to Turn into Liquid
Water vapor often turns back into its liquid form when it cools down. This process is known as condensation. It does not occur when water reaches its boiling point, as boiling is the transition from liquid to gas due to increased temperature. Instead, condensation happens when the temperature drops, allowing water vapor to lose energy and transition back into a liquid state. In the water cycle, this is a critical stage, as it is responsible for the formation of clouds, dew, and precipitation that is essential for sustaining various ecosystems.
Furthermore, factors like high pressure can also encourage the conversion of water vapor to liquid by pushing the molecules closer together, facilitating the formation of liquid. In closed environments, this dynamic balance between evaporation and condensation keeps the amount of liquid and vapor steady until external conditions change. Condensation is an integral part of natural processes that sustain life on Earth.