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.
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- 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]
- g = standard acceleration due to gravity [ms-2]
See also: Archimedes′ Principle, Force, Terminal Speed.
Subjects: Mechanical Engineering Physics