Condensation is the process of

• A. The process of turning liquid into vapor.
• B. The process of reducing water vapor to a liquid or solid form.
• C. Helping increase humidity in the air.
• D. Happens only outdoors.

Answer: (B)

Condensation is the change of water vapor in the air into a liquid as energy is removed from the vapor, usually when air cools. You see this as dew on grass, fog, or clouds. The idea that water vapor is reduced to a liquid (and, at very cold temperatures, to a solid) fits condensation well, since the vapor is changing state and becoming liquid droplets (or, in some cases, solid frost).

The other statements describe evaporation (liquid turning into vapor), increasing humidity (condensation actually removes vapor from the air locally by forming liquid), and it happening only outdoors (condensation can occur indoors as well).