Calculating Pressure Difference in Two Tanks

AI Thread Summary
To calculate the pressure difference between two tanks containing SAE Grade 30 oil and carbon tetrachloride, the densities of the fluids are essential. The pressure in tank A is calculated using the formula P = Po + pgh, resulting in PA = 890 kg/m³ * 1.1 m * 9.8 m/s². For tank B, PB is calculated as 1590 kg/m³ * 0.8 m * 9.8 m/s². The resulting pressure difference PB - PA is found to be 2871.4 Pa. The discussion also raises a question about the use of Torr for calculating pressure difference, indicating a need for clarity on unit conversions in fluid mechanics.
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Homework Statement


Two tanks, one containing SAE Grade 30 oil (density of 890 kg/m3) and the other containing carbon tetrachloride (density of 1,590 kg/m3) , are connected through a differential manometer as shown in the figure. Calculate the pressure difference between chambers A and B.
Pressure_5.jpg: http://www.imageupload.org/thumb/thumb_8614.jpg



Homework Equations


760mm Hg = 760Torr. 760Torr = 1atm = 101300Pa.
P= Po + pgh


The Attempt at a Solution


The pressures are the same if there would have been no height difference.
Thus PA=890*1.1*9.8
and PB=1590*0.8*9.8
PB-Pa=2871.4 Pa.
This correct?
Quick question. why can't I use 0.3*300Torr to solve for pressure difference?
new to fluids.
 
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