Question

how does water vapour offed air pressure
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Answer 1

Answer:

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.

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Answer 2

Answer:

since water vapour is less dence then dry air

Explanation:

if both have the same temperature , the addition of water vapour decreased the overall density of the air and the lower it pressure