dew point

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dew point:

see dewdew,
thin film of water that has condensed on the surface of objects near the ground. Dew forms when radiational cooling of these objects during the nighttime hours also cools the shallow layer of overlying air in contact with them, causing the condensation of some water vapor.
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Dew Point

 

the temperature at which air becomes saturated by water vapor when cooled at a given moisture content and a constant pressure. The condensation of water vapor begins when the dew point is reached in the air or on objects in contact with the air.

The dew point is one of the major characteristics of humidity and can be calculated from the temperature and humidity of the air or determined directly with a condensation hygrometer. If the relative humidity is less than 100 percent, the dew point is always less than the actual air temperature. The dew point decreases with decreasing relative humidity.

At saturation, that is, at a relative humidity of 100 percent, the actual temperature coincides with the dew point. Thus, at a temperature of 15°C, the relative humidities of 100, 80, 60, and 40 percent correspond to the dew points of 15.0°, 11.6°, 7.3°, and 1.5°C, respectively.

dew point

[′dü ‚pȯint]
(chemistry)
The temperature and pressure at which a gas begins to condense to a liquid.
(meteorology)
The temperature at which air becomes saturated when cooled without addition of moisture or change of pressure; any further cooling causes condensation. Also known as dew-point temperature.

dew point

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If the temperature is +30°C and there is 15 gm of water vapor per kg of dry air and the air is cooled to +20°C, saturation will occur. +20°C is the Dew point. Similarly, Dew point is +33°C if air with 5 gm of water vapor per kg is cooled till it becomes saturated.
The temperature to which a given parcel of air must be cooled at constant pressure and constant-water-vapor content for saturation to occur. It is the temperature at which the saturation vapor pressure of the parcel is equal to the actual vapor pressure of the contained water vapor. Any further cooling usually results in the formation of dew or frost. Also called the dew-point temperature. When this temperature is below 0°C, it is sometimes called the frost point.
References in periodicals archive ?
With the addition of a dew point dependent switching feature for periods of intermittent load, incorporated into the electronic controller of every CDT dryer, initial investment costs are quickly amortised and life-time costs minimised.
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He assumes there is a groundcover in place, and, therefore, crawlspace dew point is the same as outside dew point.
Tokyo, Nov 26, 2010 - (JCN Newswire) - Yamatake Corporation of the azbil Group has announced that on November 16 it launched the FDW20, a low dew point version of the current FINEDEW(TM) chilled mirror hygrometer.
5) "Tests of Instruments for Measuring Hydrocarbon Dew Points in Natural Gas Streams, Phase 1," Prepared for the Measurement Technical Committee of PRCI, Inc.
That indicated that the APH had functioned at a temperature lower than dew point of water steam.
Wednesday, the temperature and dew point in Eugene were both 50 degrees, resulting in a relative humidity of 100 percent - and fog, Taylor said.
In Optimizer Mode, the new TouchView dryer control uses information gathered by a Conair Drying Monitor and regulates air temperature, dew point and air flow.
Several different methods are available for predicting hydrocarbon dew points from an analytical gas composition.
It could be 120 degrees outside, but if the dew point is low enough, animals will be fine.
Furthermore, minimum detectable quantity of approximately 2 ppm indicates that relatively low hydrocarbon dew points can be determined.
The main dryer unit options use either refrigerant methods, that are limited to dew points between +2[degrees]C to +10[degrees]C, or desiccant based adsorption dryers capable of achieving a PDP of down to -70[degrees]C for totally moisture free air.