<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The dew point is the temperature to which air must be cooled to become saturated with water vapor . When further cooled, 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 . When the temperature is below the freezing point of water, the dew point is called the frost point, as frost is formed rather than dew . The measurement of the dew point is related to humidity . A higher dew point means there will be more moisture in the air . </P> <P> Given that all the other factors influencing humidity remain constant, at ground level the relative humidity rises as the temperature falls . This is because less vapor is needed to saturate the air, so vapor condenses as the temperature falls . In normal conditions, the dew point temperature will not be greater than the air temperature because relative humidity cannot exceed 100% . </P> <P> In technical terms, the dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same rate at which it evaporates . At temperatures below the dew point, the rate of condensation will be greater than that of evaporation, forming more liquid water . The condensed water is called dew when it forms on a solid surface, or frost if it freezes . The condensed water is called either fog or a cloud, depending on its altitude, when it forms in the air . If the temperature is below the dew point, the vapor is called supersaturated . This can happen if there are not enough particles in the air to act as condensation nuclei . </P>

What is the relationship between humidity and dew point
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