if I have a 1 inch square tube with 144 feet of water I know I have about 63 pounds of water (63lbs ft**3) and 63 psi at the bottoms off the tube.
If I have a 1/4 inch sq tube filled with water at 144 feet. I know this is only 15.x lbs (i.e. 1/4 of above) of water total. If I measure this at the bottom across a 1 inch plate, I should only get 15 lbs of water. Yet I know from every other discussion that I will read 63 psi if I put a pressure meter on the bottom of that tube. Please provide the equation that clearly differentiates this logic. - Embarrassed Engineer.