FLUID MECHANICS (TUTORIAL) CHAPTER TWO BY: MOHAMMED DHEYA Problem 2.8 What are the gauge pressure and absolute pressure at a point 3 m below the free surface of a liquid having a density of 1.53 x103 kg/m³ if the atmospheric pressure is equivalent to 750 mm of mercury? The specific gravity of mercury is 13.6 and density of water 1000 kg/m³. Solution. Given: Depth of liquid, Z₁ = 3m Density of liquid, p₁ = 1.53 × 103 kg/m³ Atmospheric pressure head, Zo = 750 mm of Hg 145090 N/m².