so as water vapor increases, the density of air decreases. Temperature also changes the density of air. As air gets warmer it expands and becomes less dense, causing atmospheric pressure to fall.

It explains that boiling point is the temperature at which a liquid's vapor pressure equals atmospheric pressure, and demonstrates how changes in pressure affect the boiling point of water through ...

and condenses the water vapor into clouds, often resulting in rain. During the Atlantic hurricane season, forecasters often alert the public when atmospheric pressure over a region of the ocean ...