Which of the following is a transition from gas to liquid?

• A. Evaporation
• B. Vaporization
• C. Condensation
• D. Melting

Answer: (C)

The transition from gas to liquid is known as condensation. This process occurs when vapor, which is in a gas state, cools and loses energy, allowing molecules to come together and form a liquid. This is commonly observed when water vapor in the atmosphere condenses into droplets on a cold surface, such as when dew forms on grass in the early morning.

In contrast, evaporation and vaporization refer to the process of a liquid changing into a gas, while melting describes the transition from solid to liquid. Understanding these processes helps clarify the fundamental properties of matter and phase changes, particularly in the context of hazardous materials where controlling environmental conditions is crucial.