Question

air pressure with the decrease of water vapour in the air
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Answer 1

Answer:

Any increase in vapor pressure (the result of any additional water molecules being moved into the air over the water) will cause a corresponding number of water vapor molecules to move from the air to (because the air temperature is above 32 degrees F) water.

Answer 2

Answer:

As humidity increases pressure decreases. Since water vapor is less dense than dry air if both have the same temperature, the addition of water vapor decreases the overall density of the air and lowers its pressure.