Multiply by 144, since there are 144 square inches in a square foot (12x12).
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To convert inch-pounds to foot-pounds, you divide the number of inch-pounds by 12 since there are 12 inches in a foot. Therefore, to convert 105 inch-pounds to foot-pounds, you would divide 105 by 12, which equals 8.75 foot-pounds.
Given that there are 144 square inches per square foot, 100,000 pounds per sqaure foot equals 694.44 pounds per square inch.
One inch of rain over one square foot is 1/12 cubic foot of water. A cubic foot of water weighs about 62.4 pounds. 1/12 of that is about 5.2 pounds.
The density of aluminum is approximately 0.098 pounds per cubic inch. To convert this to pounds per cubic foot, you would first convert cubic inches to cubic feet (1 cubic foot = 1728 cubic inches) and then multiply by the density in pounds per cubic inch. Therefore, the density of aluminum in pounds per cubic foot is approximately 169 pounds per cubic foot.
Pressure in seawater at 100 feet is 44 psi. Or, .44 pounds per square inch per 1 foot. For Fresh water, it is .43 psi per foot.