Hydraulics is the science of forces and movements transmitted by means of liquids. It belongs alongside hydro-mechanics. A distinction is made between hydrostatics – dynamic effect through pressure times area – and hydrodynamics – dynamic effect through mass times acceleration.
Hydrostatic pressure is the pressure which rises above a certain level in a liquid owing to the weight of the liquid mass:
In accordance with the SI international system of units, hydrostatic pressure is given in both Pascal and bar. The level of the column of liquid is given the unit “metre”, the density of the liquid “kilograms per cubic metre” and the acceleration due to gravity “metres per second squared”.
The hydrostatic pressure, or simply “pressure” as it is known for short, does not depend on the type of vessel used. It is purely dependent on the height and density of the column of liquid.
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