Linked from
The 16 pages that link to Dew point, each with the reason it gives.
Relative humidityRelated: It gives another way to express how close the air is to saturation.
CondensationRelated: It marks the temperature at which condensation can begin in air.
FogRelated: Fog often begins when air cools to its dew point and vapor condenses.
HumidityRelated: It expresses moisture content as the temperature where condensation begins.
PsychrometricsRelated: It identifies when cooling first causes water vapor to condense.
HumidifierRelated: It helps explain why added moisture can condense on cold windows and walls.
MistRelated: Cooling air to its dew point can trigger the condensation that forms mist.