The temperature at which the water vapour present in the air is just sufficient to saturate air is

The temperature at which the water vapor present in the air is just sufficient to saturate the air is called the dew point. When the air is saturated with water vapor, it can no longer hold any more water vapor, and the excess water vapor condenses into tiny droplets, which form dew on surfaces such as grass, leaves, and windows. The dew point varies depending on the amount of moisture in the air. Higher humidity levels in the air will lead to a higher dew point, while lower humidity levels will lead to a lower dew point. In summary, the dew point is the temperature at which the air becomes saturated with water vapor, and any additional water vapor will condense into dew.