What is the process by which moisture vapor changes to liquid form?

What is the process by which moisture vapor changes to liquid form?

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

Answer: (C)

Condensation is the process by which moisture in the air changes into a liquid. This happens when water vapor cools or when air becomes saturated, causing the vapor to lose enough energy to transition to a liquid state. In buildings, condensation appears as dew on surfaces, fog, or dampness on pipes and HVAC coils when temperatures and humidity align at or near the dew point. Knowing this helps with humidity control and preventing moisture-related issues like mold. The other terms describe different state changes: sublimation is solid turning into vapor, deposition is vapor turning into solid, and evaporation is liquid turning into vapor.

Condensation is the process by which moisture in the air changes into a liquid. This happens when water vapor cools or when air becomes saturated, causing the vapor to lose enough energy to transition to a liquid state. In buildings, condensation appears as dew on surfaces, fog, or dampness on pipes and HVAC coils when temperatures and humidity align at or near the dew point. Knowing this helps with humidity control and preventing moisture-related issues like mold. The other terms describe different state changes: sublimation is solid turning into vapor, deposition is vapor turning into solid, and evaporation is liquid turning into vapor.