dew point

This term is a technical measurement used primarily in meteorology and thermodynamics. It describes a specific threshold of temperature rather than a general state of weather, making it a precise scientific marker for humidity levels.

In practical application, when the actual air temperature drops to the dew point, the air becomes saturated and water vapor condenses into liquid droplets. This process is what creates dew on grass or fog in the air. It is distinct from relative humidity, as the dew point provides an absolute measure of moisture regardless of the current temperature.