If you had a tube running from the top of one tank at a lower level to the top of another tank at a higher level.
And the water could only flow in one direction towards the higher tank.
And the water level in the high tank started to descend.
I think the tube would pull water up because of atmospheric pressure on the low tank pushing the water up.
But what makes the water in the supply tube of the higher level tank descend?
The Attempt at a Solution
Wouldn't the atmospheric pressure in the higher tank transfer its pressure to the water in the tube. So the water in the supply tube is 14.7psi. the same pressure as the surface of the water in the tank.
Or does gravitational potential energy play a factor