Why exactly are there areas of higher or lower pressure? Is it the air masses? I know what accompanies them, but why does pressure drop and rise in one spot?
by 
Blackberry.
ANSWERS: 3
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http://www.nationalgeographic.com/media/world/amfacts/amaz6.html . It also has a lot to do with this: http://en.wikipedia.org/wiki/Avogadro%27s_law
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Well, let me just say this about that. Pressure is important. In fact, it may be more important than weather forecasting itself. Whether you live where the pressure is high or low, that pressure is vastly important! And that's all I've got to say on the subject.
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The answer is heat from the sun, which warms darkish land masses more quickly than it warms shiny water masses. When air gets hot from contact with these warm mases it expands and rises. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A second effect is the evaporation of water again caused by heat. Oddly enough water vapour is lighter than dry air at the same temperature. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Air pressure can be thought of as the weight of molecules in an imaginary column of air above you, so when a warmed air mass rolls in people on the ground below experience a drop in air pressure.
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