by **Dirtman** » Sun May 18, 2008 1:11 am

Pressure in a column is planar, depending on the height of the column, so in this instance, pounds per ft^3 is pounds per ft^2. There are 144 square inches in a square foot (12 * 12), so run the formula and divide the answer (pounds per ft^2) by 144 to get pounds per in^2 (psi).