Buoyancy Force
Buoyancy Force - Related Videos
11:30
Buoyancy and Drag on Immersed Bodies
0 Views •
2023
Source: Alexander S Rattner and Sanjay Adhikari; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Objects, vehicles, and organisms immersed in fluid mediums experience forces from the surrounding fluid in the form of buoyancy- a vertical upward force due to fluid weight, drag- a resistive force opposite the direction of motion, and lift- a force perpendicular to the direction of motion. Prediction and characterization of these forces is...
01:12
Buoyancy
0 Views •
2025
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid? To get...
03:18
Flotation-Based T Cell Isolation Using Buoyancy-Activated Cell Sorting
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2025
This video demonstrates T cell isolation from peripheral blood mononuclear cells (PBMCs) using the functionalized buoyancy-activated cell sorting (BACS) technology. The isolation technique involves the positive selection of CD3+ T cells by labeling the cells with biotinylated anti-CD3 antibodies and separating the antibody-bound cells using streptavidin-bound microbubbles.
10:03
Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Cited by 7 •
2018
Here, we present an experimental method for decoupling the interdependent Coriolis-force and rotating-buoyancy effects on full-field heat transfer distributions of a rotating channel.
08:00
A Buoyancy-based Method of Determining Fat Levels in Drosophila
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Cited by 19 •
2016
Here we present a method to measure organismal fat levels in the third instar (L3) larval stage of Drosophila melanogaster. This method exploits the comparatively low density of fat tissue to differentiate between larvae with altered fat stores. Buoyancy-based analysis is a valuable tool for rapid, reproducible, and economical screening.
FAQs
Fluid pressure increases with depth, so the lower portions of an immersed object experience greater pressure than the upper portions. These unequal pressures produce a net upward effect rather than canceling completely. The resulting force corresponds to the weight of the fluid displaced by the object, providing the mechanical basis for Archimedes’ principle and buoyancy calculations.
The displaced fluid provides the reference for calculating the upward force. Archimedes’ principle states that the buoyancy force equals the weight of this displaced fluid, so both the fluid and the amount displaced affect the result. Engineers can therefore evaluate buoyancy by relating an object’s submerged volume to the weight of the surrounding fluid it displaces.
The object’s motion depends on the relationship between the upward buoyancy force and the object’s weight. If the upward effect exceeds the weight, the object rises; if the weight is greater, it sinks; and if the two balance, it remains suspended. This relationship also supports density-based separation systems, where objects or materials respond differently in a fluid.
Buoyancy affects more than whether a body floats. Its magnitude and distribution influence how engineers evaluate stability and load capacity in structures interacting with fluids. Accounting for displaced fluid and the resulting upward force helps determine whether a design can support intended loads and maintain acceptable behavior in operating conditions involving water or other fluids.
An assessment should consider the fluid surrounding the object, the amount of fluid displaced, and the object’s weight. The displaced fluid determines the upward force, while comparison with the object’s weight indicates whether it rises, sinks, or remains suspended. Engineers use these relationships to examine stability, load capacity, and the consequences of fluid displacement.
For ships, submarines, and offshore structures, buoyancy analysis links fluid displacement with stability and load capacity. Engineers use the upward force to judge how these structures behave in water and whether their designs can support intended loads. The same principle helps assess structures that must operate reliably while immersed, floating, or exposed to changing fluid conditions.
Pipelines and aircraft components can encounter fluids that exert upward forces, making buoyancy relevant to their design and evaluation. Engineers account for fluid displacement when considering how these components behave and how their loads are supported. Including buoyancy in the analysis helps connect fluid interaction with structural performance, particularly where stability or load capacity is important.
Flotation devices rely on the upward force generated by displaced fluid to support a person, object, or structure. Density-based separation systems use the same force to distinguish materials according to how they respond in a fluid. These applications show how buoyancy converts fluid displacement into practical control over support, floating behavior, and material separation.