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about 2 psi. (0.5 psi / foot of depth)
It is precisely a square of siding to which each edge measures one foot. Therefore, each side of the square of siding is one foot in length.
There is nine square feet on a 3 by 3 square board game.
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How much water do I have a 16x32 foot pool with debt of 4 foot to 6 foot