Kiln dried Red Oak at 6 percent moisture content weighs 4.444 ounces per cubic inch WRONG! 4.444 ounces per cubic inch is off by a factor of 10. It should be .4444 ounces per cubic inch
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You can't say 'pressure per square inch. It's just 'pressure', which equals force per square inch. You divide the person's weight by the area of the foot in contact with the stairs to get the answer.
4102.6lbs per square inch
250 pounds per square inch (PSI)
A box of Bruce natural oak, 3/4 inch thick, 2 1/4 inch wide, random lengths is euqal to roughly 20 square feet per box.
The support provided by 5 samples would be 5 times greater than that of 1 sample, but the weight expressed by the 500 gram weight remains constant.