At a hill station a barometer shows a mercury column height of 650mm. A student wishes to use an alcohol manometer (density 790kgm−3) to measure the same atmospheric pressure.
(a) Determine the atmospheric pressure at the hill station in pascals.
(b) Calculate the corresponding height of the alcohol column required to balance this pressure.
(c) If the barometer is carried from the hill station down to sea level where the mercury height becomes 760mm, compute the additional force exerted by the atmosphere on a horizontal surface of area 1m2 due to the increase in pressure.