The process of liquid changing into gas.

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

Answer: (C)

Evaporation is the process by which a liquid becomes a gas. It happens when molecules at the surface gain enough energy to overcome the forces holding them in the liquid and escape into the air. This can occur at temperatures below the liquid’s boiling point, which is why evaporation happens gradually and often cools the liquid as the higher-energy molecules leave. Boiling is a related form of vaporization that occurs throughout the liquid at a specific temperature, but the general liquid-to-gas change described here is evaporation. The other processes involve the reverse or different transitions: condensation is gas turning into liquid, sublimation is solid turning directly into gas, and freezing is liquid turning into solid.