Well if the tube is sealed with no air inside of it. Thus creating a vacuum in the tub. A vacuum has much less pressure than the atmosphere's pressure. As soon as you open it , the water should rush into the tube. I just don't know if the water will go all the way up it into space, or just stop...
I don't know much about Physics. But I just want to know what would happen.
I read about pressure gradient and what I take from it, that the water would not go up it because the pressure from the atmosphere would keep it down. Would that also keep down air and other gases if that's the case?
If you have a tube with no air in it, making the the tube a vacuum. And stuck one end in space and the other end in the Earth's ocean. Then Opened both ends. Would it suck all the water out into space? If not what would happen?