# 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

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 ?
Under a hot-dry climate, the differences between the Melchor (1982a) model and ambient temperatures are twice the value in the morning than that during late hours due to low dew point temperatures.
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).
One of the main causes for fluctuating residual moisture content is variations in residence time in the drying equipment, the drying temperature, the dew point temperature of the drying gas and the impact of contact with the ambient air.
Capable of keeping the dew point temperature inside shipping containers below the actual temperature, they prevent cans from rusting, labels from peeling off packages, and other moisture damage.
This equipment can be used for drying experiments in the range of 5[degrees]C to 200[degrees]C air temperature, and 4[degrees]C to 80[degrees]C dew point temperature.
While the surface temperature and dew point temperature are measured at most airports, the hydrolapse is not a directly observable meteorological field.
In Figure 5, the histograms show the frequency of dew events at different temperatures below the dew point 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.
Dry Bulb and Dew Point temperature forecasts for the Sacramento region
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.
However, in hot and humid climate when the cooling load is mostly dominate year round, other factors that may play role in energy consumption is the outdoor air dew point temperature.

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