Originally Posted by
PEI_3721
Hold a sheet of paper in front of your mouth; blow over it (on the top side only). The paper should rise, the pressure falls thus the paper rises.
Now, hold the paper so it hangs vertically. Blow down over one side (ie same experiment but twisted 90 degress so paper hangs down,). Shouldn't the paper curl to the side you blow?
Try it! Very easy to do.
It just hangs vertically, doesn't move towards the "blown" side despite air moving over one side faster.