my comment about metric being easier was a little facetious
I'm a mere student at the moment and one of the things I struggle with is units.
I was pretty much educated in SI units . I find it tricky working in feet, miles and the like because I don't have a good "feel" for the numbers. Obviously I know how many metres in a Km but feet in a mile (either type) is not intuitive to me.
as for the formula that links feet , degrees C and inches of mercury . Well that just makes my head hurt!