By lowering temperature, unsaturated air can turn into saturated air, causing condensation—the formation of liquid water droplets. This occurs, for instance, on water pipes in summer or windows in winter, when wet air cools to the dew point.
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Answer: Under the condition of unchanged water content, unsaturated air can be made into saturated air by lowering its temperature.
At the moment when unsaturated air becomes saturated air, liquid water droplets will condense in the wet air. This phenomenon is called "condensation". Condensation is common. For example, in summer, the air humidity is very high, and it is easy to form water droplets on the surface of the water pipe. In winter mornings, water droplets will appear on the glass windows of residents. These are all the results of condensation when wet air is cooled to the dew point temperature under constant pressure.
