You choose to use a mercury (p = 13,500 kg/m3) manometer to check the accuracy of a pressure gage on a compressed nitrogen gas tank. The manometer is set up between the tank and the atmosphere, and the height difference for the mercury in the two legs is 1.52 m. The pressure gage to be checked reads a pressure of 275 kPa for the gage pressure of the tank. Is the pressure gage accurate?
Given: p = 13,500 kg/m3; L = 1.52 m; Pg = 275 kPa (measured)
Assume: g = 9.81 m/s2
?P = pgL = 201,300 N/m2 = 201 kPa
The pressure gage is not accurate.
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