![]() ![]() The actual value of the pressure at the bottom of the tank under consideration is 2.49 bar, and half of this value consists of the external pressure. Assuming an atmospheric pressure of 1013.25 hPa and acceleration due to gravity g = 9.81 m/s2, the pressure of the liquid at the bottom of the tank is: The height h of the water in the tank is 15 m. The density of the liquid is ρ = 1000 kg/m3. What is hydrostatic pressure? - A case studyĬonsider the pressure at the bottom of an open container of water at 4 ☌. In closed tanks, the external pressure is equal to the pressure above the surface of the liquid. ![]() In open tanks, the liquid pressure is the sum of the pressure due to weight at a certain height and the atmospheric pressure above the level. The average value of atmospheric pressure at sea level is 1013.25 hPa. ![]() For example, atmospheric pressure corresponds to the pressure exerted on the earth's surface by the weight of a column of air whose height is equal to the thickness of the earth's atmosphere. ![]() The external pressure also affects the pressure of the test liquid. A liquid with a high density, such as water, exerts more pressure on the bottom than a liquid with the same volume but lower density, such as oil. Similarly, the pressure depends on the density of the liquid. Thus, the hydrostatic pressure in a liquid increases with depth. The higher the liquid column, the higher the pressure at the bottom of the tank. The pressure in a fluid at rest (non-fluid), on which a homogeneous gravitational field acts, is called hydrostatic pressure.
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