2. A simple mercury manometer connected into a flow line gives reading as shown in the figure. Local gravity is standard and the mercury density is 0.488 lb/in³. Find the pressure at pts. x and y when the flow line and left leg contain: a) air, whose density is 0.072 Ib/ft3 b) water, whose density is 62.1 Ib/ft3 c) answer (a) and (b) if local gravity is 30 ft/sec?
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