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The Dew Point temperature is defined as the temperature at which moisture will condense out of the air. The dew point temperature varies with relative humidity and air pressure. For dew to form, the moisture must go from vapour to liquid state. In conditions of high humidity, there are more water molecules in the air and the forces holding them in suspension will be low. So the temperature at which they will condense will be lower than what it would be under conditions of low humidity. As air pressure decreses, the dew point also falls. Most practical dew point estimates assume a constant air pressure to save the added cost of a barometric pressure sensor. If the dew point temperature is over 0 degrees celsius, the moisure condenses as dew. If the dew point is less than zero, frost will form. |
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