# Water column's pressure canceling out problem and it's microscopic point of view

If you see my horrible reference picture, you will see that the U shaped tube is placed inside the field where gravitational force exist. And the bottom of the tube is opened, tube is filled with liquid. the density of liquid is ρ, acceleration of gravity is g, and each column's height is h

I used to conclude that the water won't flow down, because the pressure occurred from each side of water column would eventually cancel each other, thus no more pressure exist.

But if that should be the correct answer shouldn't there be a premise that " there exist attraction force between liquid molecules which is greater than the pressure exerted on the end of the liquid (=ρgh)"?

• I have a hard time figuring out what you mean. In which direction does gravity point? Commented Jul 6, 2020 at 17:27
• @DavideDalBosco Downward. sorry I forgot that. Commented Jul 6, 2020 at 17:54
• It would help if you would provide a moderately detailed explanation of the drawing. Commented Jul 6, 2020 at 18:07
• @DavidWhite I edited my question let me know if more information is required. OMG, after re-read my question, I found that it's so poorly described. Maybe it's because I was dozing. Commented Jul 6, 2020 at 18:29