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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.
You are halfway there where you want to be or other word you are halfway at your dream
As my old scout leader used to say, along the corridor then up the stairs. x = the corridor or horizontal axis y = stairs or the vertical axis
A pair of stairs is another term for a flight of stairs.
If you mean 'how many inches are in a foot', there are 12 inches in 1 foot.