Which statement is true about condensation?

• A. Condensation is the liquid to gas change.
• B. Condensation is the gas to liquid change when cooled.
• C. Condensation occurs only at high energies.
• D. Condensation is not a real process.

Answer: (B)

Condensation is the gas-to-liquid phase change that happens when a gas loses energy, usually by cooling. When water vapor in the air cools, its molecules slow down and come together to form liquid water. That real process is what we observe as dew, fog, or steam turning back into liquid on a cold surface. So the statement that condensation is the gas turning into a liquid when cooled is the accurate description.

The other ideas don’t fit: turning liquid into gas would be evaporation or boiling, not condensation; condensation does not require high energies—in fact it involves energy loss; and condensation is a real, observable process.