The venturi flowmeter shown in the figure is used to measure the flow rate of water in a solar collector system. The flowmeter is inserted in a pipe...

The venturi flowmeter shown in the figure is used to measure the flow rate of water in a solar collector system. The flowmeter is inserted in a pipe with diameter 1.9 ; at the venturi of the flowmeter the diameter is reduced to 0.64 . The manometer tube contains oil with density 0.82 times that of water.