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What is the process called in which a substance changes from a gas to a liquid?

A Condensation

When a substance undergoes a phase transition from a gas to a liquid, this phenomenon is known as condensation. Evaporation and vaporization both describe the process of changing from a liquid to a gas, though vaporization is the more general term. Evaporation refers specifically to vaporization occurring at temperatures beneath the substance’s boiling point. Sublimation refers to a change from a solid directly to a gas (as in the case of dry ice).