cpa its not just the mass, it is the mass and the height. Suppose in my original example the two columns, 100' and 1000', were each in pipe with 1 square foot cross section. Suppose that I pour the water in the 1000' column into a pipe with a 50 square foot cross section. Then that water column would only be 20' tall. Then the pressure at the bottom of that 20' column would be lower than the 100' column, even though the 20' column had ten times more mass.

Same with 1 ounces of shot in the 28 gauge and the 12 gauge. In effect, the water is deeper in the 28 gauge and so the pressure at the bottom of the column is higher.


I am glad to be here.