Buoyant instability: Difference between revisions

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|Display title=buoyant instability
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|Meaning=That [[static instability]] in a system in which [[buoyancy]] or [[reduced gravity]] is  the only restoring force on displacements.
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|Explanation=In general, a fluid is buoyantly unstable when the [[environmental lapse rate]] of [[density]] is  greater than the [[process lapse rate]] of density. For an [[incompressible fluid]] this requires an  increase of density with height; for the [[atmosphere]], when lifting is assumed to be [[adiabatic]], it  requires the [[lapse rate]] (of [[temperature]]) to be greater than the [[adiabatic lapse rate]].
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== buoyant instability ==
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<div class="definition"><div class="short_definition">That [[static instability]] in a system in which [[buoyancy]] or [[reduced gravity]] is  the only restoring force on displacements.</div><br/> <div class="paragraph">In general, a fluid is buoyantly unstable when the [[environmental lapse rate]] of [[density]] is  greater than the [[process lapse rate]] of density. For an [[incompressible fluid]] this requires an  increase of density with height; for the [[atmosphere]], when lifting is assumed to be [[adiabatic]], it  requires the [[lapse rate]] (of [[temperature]]) to be greater than the [[adiabatic lapse rate]].</div><br/> </div>
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Latest revision as of 22:23, 13 January 2024

That static instability in a system in which buoyancy or reduced gravity is the only restoring force on displacements.

In general, a fluid is buoyantly unstable when the environmental lapse rate of density is greater than the process lapse rate of density. For an incompressible fluid this requires an increase of density with height; for the atmosphere, when lifting is assumed to be adiabatic, it requires the lapse rate (of temperature) to be greater than the adiabatic lapse rate.


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