I've been arguing with a friend about the whole "perfect vacuum" concept. He and I agree that the most powerful vacuum pump in the world couldn't pump water more than ~34 feet above the surface of a regular elevation lake. I changed the problem slightly, and I'm not sure what would happen.
- Submerge a hose such that it was completely filled with water
- Cap off the top end
- Start pulling it out of the water by a crane
- Make sure the bottom end stays submerged
If you pulled the hose 40 feet out of the water, what would be in the top 6 feet of the hose? A "perfect vacuum"? Gaseous water? Liquid water?