Question

question 2
how does humidity affect air pressure?
humidity does not affect air pressure.
humidity increases air pressure by adding more air molecules.
humidity increases air pressure by making the air heavier.
humidity decreases air pressure because water vapor is less dense than dry air

Explanation:

Water vapor in humid air is less dense than dry - air molecules. When humidity increases, water vapor replaces some of the dry - air molecules. Since water vapor is less dense, the overall density of the air decreases, and according to the relationship between air density and air pressure, this leads to a decrease in air pressure.

Answer:

Humidity decreases air pressure because water vapor is less dense than dry air.