Explain how differences in fluid pressure create buoyant force on an object

It can be explained by the principle of Archimedes

Explanation:

The Archimedes principle tells us that "every body submerged within a fluid experiences an upward force called thrust, equivalent to the weight of the fluid dislodged by the body."

We apply this principle when we swim, when we throw an object into the water; the object sinks if its weight is greater than the weight of the dislodged (displaced) fluid. The object floats when its weight is less than or equal to the weight of the displaced fluid.

The flotation phenomenon consists in the apparent loss of weight of objects submerged in a liquid. This is because when an object is submerged within a liquid, the liquids exert pressure on all the walls of the container that contains them, as well as on any body submerged within the liquid. The lateral forces due to hydrostatic pressure, which act on the body, balance each other, that is, they have the same value for the same depth. This does not happen for the forces acting on the upper and lower part of the body. These two forces are opposite, one due to its weight that pushes it down and the other, which by pushing force, pushes it up. As the pressure increases with depth, the forces exerted in the lower part of the object are greater than those exerted in the upper part, the result of these two forces must be directed upwards. This result is what we know as the buoyant or thrust force that acts on the body, tending to prevent the object from sinking into the liquid.

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