Pressures at the water levels in the two open tanks?

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[PLAIN]http://img814.imageshack.us/img814/3943/fluidmechanics.jpg [Broken]

Please let me know is my assumption correct?

P1 = P2 = P4 = P5 = Atmospheric pressure

P2 not equal to P3, and P3 is not under the atmospheric pressure.

P2 not equal to P3 even are the same fluid, is because of the same fluids are not connected. Am i right to say that?

# How do i convert -30mm Hg(mercury) to pressure?
 
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rl.bhat

Homework Helper
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# How do i convert -30mm Hg(mercury) to pressure?

Pressure P = ρ*g*h, where ρ is the density of the mercury.
 

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