Pioneering scientists discovered atmospheric pressure (also known as barometric ... The height of a mountain determines, approximately, the density of air on its summit. As air becomes less ...

1646: Pierre Petit tests Blaise Pascal's theory that atmospheric pressure decreases with height, by carrying a barometer to the top of a small mountain in France. This experiment confirms that the ...

Rounds of heavy mountain snow, lasting through the weekend, could accumulate several feet in the Cascades and Sierra Nevada. The storm will probably qualify as an atmospheric river — a long ...

A powerful storm that is threatening a dangerous severe weather outbreak in the South Tuesday is expected to bring widespread impacts on its northern flank across the Midwest, with potentially ...

Or as Granny used to say "if you can see the Black Mountain it’s going to rain. If you can’t it's already raining." Air pressure is sometimes also called atmospheric pressure. This is the ...