Water levels are used, for example, in construction technology, whereby electronic sensors are mostly used nowadays. Since the same water level is reached in both vessels, it is very easy to set the same level even over long distances where simple spirit levels cannot be used. The water level can be read off the scales. Two vessels are each provided with a scale and connected to each other by a flexible tube filled with water. The fact that identical water levels form in vessels that are connected to each other is technically used in so-called water level devices. If this were the case, currents would form and there would be no equilibrium. Thus, there cannot be two different hydrostatic pressures at a certain depth. The fact that identical hydrostatic pressures form in the equilibrium state is also shown by the fact that pressures in liquids act equally in all directions. It was shown that the hydrostatic pressure p h depends only on the depth hbelow the liquid surface besides the density ϱ of the liquid and the gravitational acceleration g: Hydrostatic pressure is the force exerted by a fluid at rest on the surface unit with which it is normally in contact with it.In the article Pressure in liquids, the formation of hydrostatic pressure and its calculation was explained in detail. From the density d = m / V we can obtain the mass m = d V and from this the force-weight of the liquid F = g m = g d V. The pressure that the liquid exerts on the bottom of the glass is equal to the force-weight of the liquid F divided by the base area of the container: p = F / A. What law explains the value of the hydrostatic pressure at the bottom of a glass? The pressure due to the weight of a liquid is directly proportional to both the density of the liquid and the depth of the liquid. Measure Archimedes’ thrust in objects of different mass, but equal volume. What causes the hydrostatic pressure exerted on the bottom of a container containing liquid? For water it is possible to adopt the rough rule that a pressure of 1 bar corresponds to a level of 10 meters. This rule can be used to select the measuring range of the submersible level probe or the pressure sensor.
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