What Process Turns a Gas into a Liquid?

The correct answer is c) condensation. When a gas is cooled down, its molecules lose energy and move closer together, transitioning into the liquid state. This process, known as condensation, occurs when the gas reaches its dew point and starts to form liquid droplets. You can observe this process when water vapor in the air condenses on a cold surface, like a glass of ice water, forming droplets on the outside.