dew-point, the temperature at which the air is saturated with the water-vapour which it contains.
This is dew; and the temperature at which the air is saturated with vapor, is called the dew-point.
In the twenty-eighth line of this table and in the seventh column will be found the dew-point, viz., 41.
Amongst the various contrivances for accomplishing859 this end are Daniels dew-point hygrometer; and the wet bulb hygrometer.
The temperature at which the haze first appears is the dew-point.
Hence the utility of instruments for determining the dew-point.
That point of temperature at which the moisture of the air first becomes visible is known as the dew-point.
At the height of one mile the temperature was 41 degrees and the dew-point 38 degrees.
The dew-point apparatus, now discontinued, approximates very closely in its readings to the dry and wet bulb thermometers.
Temperature 229 above the average, and the complement of the dew-point 240 below the mean of the two preceding years.
|dew point |
The temperature at which the water vapor contained in a volume of air at a given atmospheric pressure reaches saturation and condenses to form dew. The dew point varies depending on how much water vapor the air contains, with humid air having a higher dew point than dry air. When large droplets of condensation form, they are deposited onto surfaces as dew. When smaller droplets form, they remain suspended in the air as mist or fog. If the dew point is below the freezing temperature of water (0°C), the water vapor turns directly into frost by sublimation.