converting lbs/ft3 to lbs/in2

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converting lbs/ft3 to lbs/in2

Postby AKHandyman » Fri May 02, 2008 8:13 am

I have this math problem:

The pressure at the bottom of the lake is found by the formular P = hD, where h is the depth of the water and D is the density of the water. Find the pressure in lb/in2 at 500ft below the surface. D=62.4 lb/ft3.

I am lost as to what is the conversion factor ???
AKHandyman
 

Postby 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).
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