Buoyancy: Difference between revisions
From Glossary of Meteorology
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|Meaning=#That property of an object that enables it to float on the surface of a liquid, or ascend through and remain freely suspended in a compressible fluid such as the [[atmosphere]]. | |||
|Explanation=Quantitatively, it may be expressed as the ratio of the [[specific]] weight of the fluid to the specific weight of the object; or, in another manner, by the weight of the fluid displaced minus the weight of the object.<br/> | |||
#(''Or'' buoyant force, buoyancy force; <br/>''also called'' Archimedean buoyant force.) The upward force exerted upon a [[parcel]] of fluid (or an object within the fluid) in a gravitational [[field]] by virtue of the [[density]] difference between the parcel (or object) and that of the surrounding fluid.<br/> The magnitude of the [[buoyancy force]] F per unit mass may be determined by [[Archimedes's principle|Archimedes's principle]] as <blockquote>[[File:ams2001glos-Be23.gif|link=|center|ams2001glos-Be23]] </blockquote> where ''g'' is the [[acceleration of gravity]], ρ the density of the buoyed [[fluid parcel]] or object, and ρ<sub>0</sub> the density of the surrounding fluid. In the [[atmosphere]], a buoyant force on an [[air parcel]] may be attributed directly to a local increase of [[temperature]] and may be written <blockquote>[[File:ams2001glos-Be24.gif|link=|center|ams2001glos-Be24]] </blockquote> where ''T'' and ''T''<sub>0</sub> are the temperatures of the heated air and that of the [[environment]], respectively. The coefficient (''T''/''T''<sub>0</sub> - 1) is sometimes called the [[buoyancy factor]]. The force ''F'' is sometimes called the [[reduced gravity]]. <br/>''See'' [[free convection]]. | |||
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Latest revision as of 12:51, 26 March 2024
- That property of an object that enables it to float on the surface of a liquid, or ascend through and remain freely suspended in a compressible fluid such as the atmosphere.
Quantitatively, it may be expressed as the ratio of the specific weight of the fluid to the specific weight of the object; or, in another manner, by the weight of the fluid displaced minus the weight of the object.
- (Or buoyant force, buoyancy force;
also called Archimedean buoyant force.) The upward force exerted upon a parcel of fluid (or an object within the fluid) in a gravitational field by virtue of the density difference between the parcel (or object) and that of the surrounding fluid.
The magnitude of the buoyancy force F per unit mass may be determined by Archimedes's principle as
where g is the acceleration of gravity, ρ the density of the buoyed fluid parcel or object, and ρ0 the density of the surrounding fluid. In the atmosphere, a buoyant force on an air parcel may be attributed directly to a local increase of temperature and may be written
where T and T0 are the temperatures of the heated air and that of the environment, respectively. The coefficient (T/T0 - 1) is sometimes called the buoyancy factor. The force F is sometimes called the reduced gravity.
See free convection.
