In communicating vessels of any shape, a stationary liquid of the same density will always settle at the same horizontal level. This happens because the pressure at any given depth in a liquid depends only on the height of the liquid column (
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If you pour liquids with different densities (like water and oil) into the vessels, the heights will be different. The liquid with the lower density will have a higher column, following the formula: voprosy paragraf23 avtor peryshkin 7 klass