Which process forms clouds as water vapor rises and cools?

Which process forms clouds as water vapor rises and cools?

• A. Condensation
• B. Evaporation
• C. Sublimation
• D. Deposition

Answer: (A)

Condensation is the process by which water vapor cools and changes into liquid droplets. When air rises, it expands and cools. As the temperature drops to the dew point, the water vapor condenses onto tiny particles in the air, forming many microdroplets that grow into clouds. This is why clouds appear where moist air is lifting and cooling. Other options don’t fit cloud formation as directly: evaporation is liquid turning into vapor, which would reduce the amount of liquid water and doesn’t explain cloud droplets forming; sublimation is solid turning directly into vapor, not part of the droplet formation that makes clouds; deposition is gas turning directly into a solid, like frost, which also isn’t how clouds are created.

Condensation is the process by which water vapor cools and changes into liquid droplets. When air rises, it expands and cools. As the temperature drops to the dew point, the water vapor condenses onto tiny particles in the air, forming many microdroplets that grow into clouds. This is why clouds appear where moist air is lifting and cooling.

Other options don’t fit cloud formation as directly: evaporation is liquid turning into vapor, which would reduce the amount of liquid water and doesn’t explain cloud droplets forming; sublimation is solid turning directly into vapor, not part of the droplet formation that makes clouds; deposition is gas turning directly into a solid, like frost, which also isn’t how clouds are created.