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An area of 1 square inch!
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.
1 square inch of ink.
it depends on both the tube wall thickness and the length of the bend and how much you bend it. Otherwise you cannot determine force.
That would also depend on the thickness of that square inch!