What property of a liquid is the principle of communicating vessels based on?

One of the properties of a liquid suggests that the free surface of a homogeneous liquid is horizontal. This is due to the fact that the pressure in liquids, as well as gases, is transmitted equally in all directions (Pascal’s law). Therefore, the free surface of the same liquid in communicating vessels is located at the same level. This does not depend on the shape of the vessels.
This property is widely used in technology, it is observed in nature.



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