posted by Kristina .
By how much does the H20 pressure exceed atmospheric pressure at 3 meters below the surface of a pool with fresh H20.
I don't know what equation to use.
You have to figure the weight of a column of water of some height h, and horizontal area A.
Weight= mg= density*volume*g
Pressure= WEight/A= density*h*g
There is a rule of thumb you ought to memorize: 10 meters of water is about equal to one atmosphere of pressure.