Which process occurs when water vapour cools and changes to liquid in the air?

Which process occurs when water vapour cools and changes to liquid in the air?

• A. Evaporation
• B. Precipitation
• C. Condensation
• D. Transpiration

Answer: (C)

Condensation is the process where water vapour in the air cools and changes into liquid. When moist air rises and cools, the water vapour loses energy and can no longer stay as a gas, so it forms tiny liquid droplets—this is how clouds form and why dew appears on surfaces on cool mornings. Evaporation is the opposite (liquid to vapour), precipitation is water falling as rain or snow from clouds, and transpiration is water vapour released by plants. So the described change is condensation.

Condensation is the process where water vapour in the air cools and changes into liquid. When moist air rises and cools, the water vapour loses energy and can no longer stay as a gas, so it forms tiny liquid droplets—this is how clouds form and why dew appears on surfaces on cool mornings. Evaporation is the opposite (liquid to vapour), precipitation is water falling as rain or snow from clouds, and transpiration is water vapour released by plants. So the described change is condensation.