This lesson will be broken into two parts over the next two weeks ... First, let’s start off by defining air pressure. It is the weight (force) of the Earth’s atmosphere pressing down on ...

Air pressure normally drops as you climb in altitude ... inversions and extreme cold surface temperatures can occur in many parts of the world. Do those conditions therefore invalidate all ...

With the straw just sitting in the glass, the pressure on the surface of the tea is the same all over, including on the little bit of surface inside the straw. When you suck the air out of the ...