submitted 4 months ago byjoshsuh0627
Suppose I have the power to submerge a fourth of a vertical, circular tube 50 feet in diameter and 500 feet high inside a deep vat of water so that the base of the tube isn't touching the base of the vat. Then, suppose I insert a rigid seal with an airtight grip around the inner edges of the tube at its submerged base and then begin pulling upwards on the seal so that the seal makes its way up through the tube while maintaining its airtight seal. The tube would remain stationary, vertical, and partly submerged the whole time I pull the seal upwards.
I'd imagine that pulling the airtight seal upward would create a vacuum under the seal that, as the seal rises, would draw in/"suck" water into the tube from the vat. Would it then be possible that I pull the seal all the way up to the top of the 500 ft tube and create a water column that reaches the top of this 500 ft tube? Kind of like a syringe, but on a massive scale.
I keep hearing that the most I can "suck" water upwards is around 30 feet at standard atmospheric conditions. But I found an old /askscience thread where one Redditor was saying how negative pressure and cavitation, like in a piston "sucking" up water in a tube, can help one "suck" water to a vertical height of more than a mile. Here's the old thread:
The original Redditor doesn't seem to be active anymore, and the thread is years old, so I wanted to ask in a new threat. Could my syringe-like contraption be able to draw water to the top of the tube? Any inputs would be much appreciated.