Buoyant Force

The upward force exerted by a fluid on a submerged or floating object. The buoyancy of hot air, the force that also lifts hot-air balloons, is the main cause of weather related flows in the Earth's atmosphere.

The buoyant force is given by:
The fraction of the object submerged is given by:

if ρobj < ρflu - the object floats
if ρobj > ρflu - the object sinks
where
F = buoyant force [N]
g = standard acceleration due to gravity [ms-2]
ρflu = density of the fluid [kg m-3]
ρobj = density of the object [kg m-3]
Vobj = volume of object submerged [m3]
Vdisp = volume of displaced fluid [m3]

See also: Archimedes′ Principle, Force, Terminal Speed.

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Subjects: Mechanical Engineering Physics