Question

How does water vaper effect air pressure

Answer 1

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Since atmospheric pressure at sea level is always approximately 1 bar, an increase in water vapor at any given location changes it very little. At high altitudes overall atmospheric pressure is lower and increases in water vapor have a greater -- though still relatively small -- impact.

Answer 2

Answer:

Explanation:

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.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.