The dew point is the temperature below which the water vapour in a volume of air at a constant pressure will condense into liquid water. It is the temperature at which the air is saturated with moisture.

What happens when temp reaches dew point?

The dew point is the temperature to which air must be cooled to become saturated with water vapor. ... When cooled further, the airborne water vapor will condense to form liquid water (dew). When air cools to its dew point through contact with a surface that is colder than the air, water will condense on the surface.

How do you find the dew point temperature?

It is calculated by dividing the total mass of water vapor by the volume of the air. Given the same amount of water vapor in the air, the absolute humidity does not change with the temperature at a fixed volume.