Incorrect, unless there no back pressure of air to press down on the water level from figure 2. If there is no air pressure present in figure 2 at the red line, THEN the water would go up as indicated in figure there. In reality it would go up further from figure 2, but not as high as figure 3. The only way for that to happen would be to create a vacuum, typically through suction, which is what happens when you use a pump at the top. You are causing a vacuum to PULL the water up from the red line in figure 2 to the red line in figure 3. That's why I said the pump is doing way more work than it should be doing.
Last edited: