The pressure drop in a duct is to be measured by a differential oil manometer. If the differential height between the two fluid columns is 3.2 cm and the density of oil is 860 kg/m³, the pressure drop in the duct is A)28 Pa B) 135 Pa C)482 Pa D)270 Pa E) 760 Pa

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Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
rho=860 "kg/m^3"
g=9.81 "m/s2"
h=0.032 "m"
DELTAP=rho*g*h "Pa"
"Some Wrong Solutions with Common Mistakes:"
 W1=rho*h "not using g"
W2=rho*g*h/2 "taking half of z"

The Pressure Drop in a Duct Is to Be Measured