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 ?
5] under varying degrees of freedom for the smooth functions of time, temperature, and dew point temperature.
Dew point temperature is a measure of water vapor in the air.
Procurement - Determine Online Dew Point Temperature Water Pipelines Transport Natural Gas Through Acquisition and Installation of 5 Pcs Online Analyzers for Determining Water Dew Point Temperature - the Acquisition of A Total of 50 Portable to Determine the Concentration of the Odorant in Natural Gas Transportation Pipelines
To control for the potential confounding effects of weather, a model was constructed that included covariates for same-day (lag 0) mean temperature and mean dew point temperature with natural splines and 4 degrees of freedom (df).
If the dew point temperature (not shown in Figure 1) is used as an additional regressor in multivariate four-parameter model [MM.
Dew point temperature was set between 5[degrees]C and 30[degrees]C, air velocity on 2 m/s to 9 m/s.
In Figure 5, the histograms show the frequency of dew events at different temperatures below the dew point temperature.
Other members of the Kestrel Pocket Weather Meters Family include: the Kestrel 1000 for $89, measures current, max, average wind speed; the Kestrel 2000 for $119, measures wind speed, temperature, wind chill; the Kestrel 3000 for $179, measures relative humidity, heat stress, dew point temperature, wind chill, wind speed, temperature.
Mounted on a vehicle, it measures different road conditions such as friction, the ice percentage, the relative humidity above the road surface, the water film height up to six millimeters, the dew point temperature, drought, moisture, slushy snow and the road surface temperature.
Steadman's apparent temperature translates current weather conditions (air temperature and air moisture in the most basic formulations) into the air temperature that would "feel" the same to humans if dew point temperature were 14.
91 Dew point Temperature, Time, Day type) A-5 wi(t-1),si(t-1),cs(t-1),dt(t-1) (Wind 0.
As expected, the assumption that the fraction was entirely made up of normal hexane under-predicted the dew point temperature by 10[degrees]F (i.