The magnitude of the buoyancy force is measured in Newtons and is equivalent to the weight of the fluid displaced by the object, which is also proportional to the pressure difference. The buoyancy principle was famously discovered by Archimedes and can be stated approximately as such: "Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object". Similarly, the pressure at the bottom of a submerged object is greater than that at the top of the object which results in a pressure difference responsible for the net upward force on the object we call buoyancy force.
This is why if you push an object down slightly and remove your hand, it will float back up due to the greater buoyancy force encountered at the new depth. Pressure increases with depth due to the weight of the increasing quantity of fluid above it so the further down an object has to push its way, the more resistance it faces. Density of water and other common liquidsīuoyancy is an upward force exerted by a fluid in direction opposite to a downward force such as gravity and thus it counters (partially or fully) the weight of an object immersed in the fluid.Calculating the buoyant force - examples.
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