nail water art The dew point is the level from which the atmosphere is totally saturated with water, or 100% relative humidity. As the name suggests, this may be the point of saturation from which the thing is dew, fog, or any other forms of atmospheric condensation. Think about the clouds above. The higher the elevation, the cooler the environment temperature becomes. When the cool air condenses, there exists less space for that gaseous water vapor molecules. The cooled water vapor molecules condense into liquid molecules high in the Earth's surface by means of clouds.