tiivistymislämpötilan

Tiivistymislämpötila, often referred to as the dew point, is the temperature to which air must be cooled, at constant pressure and water content, for water vapor to condense into liquid water. When the air cools to its dew point, it becomes saturated. This means it can no longer hold all of its water vapor in gaseous form. The excess water vapor then transforms into liquid water, forming dew on surfaces or fog and clouds in the atmosphere.

The dew point is a direct measure of the absolute humidity or the amount of moisture in the air. A higher dew point indicates more water vapor is present. Conversely, a lower dew point signifies drier air. Unlike relative humidity, which is a percentage and changes with temperature, the dew point remains constant as long as the amount of moisture in the air does not change. Meteorologists use the dew point to predict the likelihood of fog, dew, or precipitation. It also plays a role in human comfort, as high dew points can make warm weather feel more oppressive due to reduced evaporation of sweat.