how does water vapour affect air pressure
Answers
Explanation:
Warm air expands. The molecules of the warm air become less dense and hence exert less pressure. ... Water Vapour: Moist air exerts more pressure as it contains fewer amounts of nitrogen and oxygen. Dry air on the other hand, exerts less pressure as it has greater amount of nitrogen and oxygen and hence is denser.
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Answer:
As humidity increases, air pressure decreases. Since water vapour is less dense than dry air, if both have the same temperature, the addition of water vapour decreases the overall density of the air and lowers its air pressure.
Explanation:
Atmospheric pressure usually decreases when humidity increases because moisture in the air displaces heavier nitrogen and oxygen molecules, reducing the weight of the air in the area. The change due to humidity may be measurable, but is usually slight. Humidity generally increases as a result of warmer air moving into the region which can bring in water vapour with it, or generate it through evaporation. So the effect of the air becoming increasingly humid is less of a factor than the temperature of the air carrying the water vapour. Warmer air will always result in reducing the atmospheric air pressure when replacing cooler air.