Hi all, I really need some help with the following question, I have to find the pressure at point B, within the manometer. height A=0.71m height B=200mm p(roh)=882 kg/m^3 p(roh)m=13784 kg/m^3 (is this the density of the gas?) Pressure at point A=156850Pa I have tried using the following equation: P1-P2=pg(h2-h1), is this correct? The answer im getting is 18196.73 Pa, but im not including p(roh)m in the equation. I hope what im trying to ask makes sense. If anybody can help, and maybe push me in the direction of a few websites, it would be mostly appreciated.