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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.
10 lbs per sf.
This question is nonsense. 180cm is a measurement of length Pounds per square inch is a measure of pressure They are not related.
About 4 tons per square inch
1.171