[![enter image description here][1]][1] Correct me if I'm wrong, I think the pressure in a fluid reduces when the speed increases(The airplane rises because the air above the airfoil moves faster than the air below it). ---------- Next, looking at the air above the surface of the water which is in a spinning glass, I'm wondering if this relative motion decreases the pressure in the air just above the water surface... If yes, **does the boiling point of the water reduce due to the loweing of this air pressure over the surface** ? [![enter image description here][2]][2] [1]: https://i.sstatic.net/WojfQ.jpg [2]: https://i.sstatic.net/feWmX.jpg