Condensation is the process by which water vapor turns into liquid. It occurs when the temperature of a surface or object falls below the dew point of the surrounding air. When this happens, the water vapor in the air condenses on the surface or object and forms droplets of liquid.

Condensation is a common problem during the winter season, when the air is colder and there is often less ventilation. It can occur on windows, walls, and other surfaces inside a building, and can lead to a variety of problems, including mold growth, structural damage, and reduced indoor air quality.

To reduce condensation, it is important to increase ventilation in the building. This can be done by opening windows or doors, using exhaust fans, or installing ventilation systems. By increasing the airflow in the building, you can help to reduce the amount of moisture in the air, which can help to prevent condensation from forming.