This force is taken due to the difference in hydrostatic pressures exerted by a liquid (water, mercury, etc.) on the lower and upper parts of a body immersed in it. For example, if a rectangular object (brick) is immersed in water, the pressure exerted by the water on the deeper surface of the brick is greater than the pressure that acts on the less deeply located surface. Hence, the pressure difference, which is directed parallel to the gravity vector, but in the opposite direction, tends to “push” the brick out of the water.
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