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Homework Statement
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 5.7 inches and the density of oil is 41 lbm/ft^3, what is the pressure drop in the duct in mmHg? Report your answer to 1 decimal place.
Homework Equations
P=pgh
760mmHg - 101.325kPa=1atm = 760torr
The Attempt at a Solution
I understand how to do it, but I am stuck at converting Lbm/ft^3 to kg/m3
I used google to get that 41Lbm/ft3 is the same as 656.74kg/m3 and with that i get the correct answer after calculations. However, i don't want to use google for all my conversions. Please help me see how to convert Lbm/ft3 to kg/m3
thank you:)
Good Day