During which phase change does a substance transition from gas to liquid?

The transition of a substance from gas to liquid is known as condensation. This process occurs when gas particles lose energy, typically due to a decrease in temperature, allowing them to come together and form liquid droplets. This is commonly observed when water vapor in the air cools and forms water droplets on a cold surface, such as a glass of ice-cold water.

In contrast, evaporation refers to the transition from liquid to gas, sublimation involves the direct transition from solid to gas without becoming a liquid, and melting is the phase change from solid to liquid. Each of these processes represents a different transition, which clarifies why condensation is the correct choice for the change from gas to liquid.