a simple manometer containing mercury is connected to a pipe in which an iol of specific gravity 0.8 is flowing. the pressure the pipe is vacuum. the other end of the manomete is open to atmosphere. find the vacuum pressure in the pipe, if the difference of mercury level in the two limb is 200mm and the height of oil in the left limb is 200mm and height of oil in the left limb from the center of the pipe is 150mm below.
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