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In dry air, the adiabatic lapse rate (i.e., decrease in temperature of a parcel of air that rises in the atmosphere without exchanging energy with surrounding air) is 9.8 °C/km (5.4 °F per 1,000 ft). The saturated adiabatic lapse rate (SALR), or moist adiabatic lapse rate (MALR), is the decrease in temperature of a parcel of water-saturated ...
Dry air does not have as much water vapor, therefore dry air cools at a higher rate with vertical movement than moist air. As a result of the latent heat that is released during water vapor condensation, moist air has a relatively lower adiabatic lapse rate than dry air. This makes moist air generally less stable than dry air (see convective ...
Humid air is less dense than dry air because a molecule of water (m ≈ 18 Da) is less massive than either a molecule of nitrogen (m ≈ 28) or a molecule of oxygen (m ≈ 32). About 78% of the molecules in dry air are nitrogen (N 2). Another 21% of the molecules in dry air are oxygen (O 2). The final 1% of dry air is a mixture of other gases.
Membrane dryers operate on the principle of migration. The compressed air to be dried is passed over a membrane that has a high affinity for water vapor. The water vapor builds on the membrane and migrates through to the opposite or low pressure, side. A dry cover gas is flowed across the low pressure side and absorbs the water on the membrane.
A dry line (also called a dew point line, or Marfa front, after Marfa, Texas) [1] is a line across a continent that separates moist air and dry air. One of the most prominent examples of such a separation occurs in central North America , especially Texas, Oklahoma, and Kansas, where the moist air from the Gulf of Mexico meets dry air from the ...
Fog or low clouds limit visibility and can cause travel delays by car and air. About 20% of vehicle crashes are weather-related each year, according to the U.S. Department of Transportation. Most ...
Tools like dehumidifiers or fans can be helpful when air drying your clothes indoors since dehumidifiers work to maintain humidity levels in the room and the fan gets your clothes dry quicker ...
The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation). This can cool air using much less energy than refrigeration. In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants.