In fog the dew point is at the surface of the earth; in summer it may be several thousands of feet above.
The temperature of the surface when the moisture first forms is the dew point.
Water boiled at 211 degrees and a fraction; but there was no dew point.
When that begins to take place the thermometer will show the dew point.
The complement of the dew point is 178 below the average of the month in the two preceding years.
The covering acts as a screen, which prevents the heat from radiating to the dew point.
In the interval, the difference between the dew point and temperature had increased from 7.5° to 17°.
But any one can easily determine the dew point without a special instrument for that purpose.
On the 14th we tried to ascertain the dew point, but failed, as in previous instances.
This temperature is the dew point of the air after it passes up into the drying chamber above the coils.
|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.