Which process occurs when water vapour cools and changes from a gas to a liquid?

Which process occurs when water vapour cools and changes from a gas to a liquid?

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

Answer: (C)

Condensation is the process where water vapour cools and changes into a liquid. When water vapour loses energy, the molecules slow down and come together, forming tiny droplets. This is what happens in clouds, dew on grass, and fog. Evaporation would be the opposite—liquid water turning into vapour, usually when heated or exposed to air. Precipitation is water falling to the surface from clouds, and transpiration is plants releasing water vapour.

Condensation is the process where water vapour cools and changes into a liquid. When water vapour loses energy, the molecules slow down and come together, forming tiny droplets. This is what happens in clouds, dew on grass, and fog. Evaporation would be the opposite—liquid water turning into vapour, usually when heated or exposed to air. Precipitation is water falling to the surface from clouds, and transpiration is plants releasing water vapour.