[XBOX999]

Hello,
I have this quetion.I do not know how to start solvin it.Can you help me please.
In the figure below, all fluids are at 20°C. Determine the pressure difference (Pa) between points A and B. Densities for water, mercury, benzene and kerosene are 1.00 g/cm3, 13.6 g/cm3, 0.8765 g/cm3, and 0.81 g/cm3, respectively.

the figure is in the attachment

[Dolphinsiu]

Very simple question. Do you remember the pressure difference due to height difference is equal to rgh?

Let the height difference between A and the end of benzene region is 20 cm (0.2 m),
Density of benzene = 0.8765 g/cm3 = 876.5 kg/m3

then pressure diff for  benzene is equal to (876.5) (-0.2) 9.8
For mercury, pressure diff equals to (13.6)(1000) (0.08) 9.8
For kerosine, pressure diff equal to (810)(0.32) 9.8
For water, pressure diff equals to (1000) (-0.26) 9.8
For air, at 20 C, air density = 1.2 kg/m3; hence pressure diff equals to (1.2) (0.09) 9.8
Just adding up...very simple