Buoyancy

(noun)

The power of supporting a body so that it floats; upward pressure exerted by the fluid in which a body is immersed.

Related Terms

  • torque
  • equilibrium

Examples of Buoyancy in the following topics:

  • Complete Submersion

    • The buoyancy force on a completely submerged object of volume is FB=VρgF_B = V \rho gF​B​​=Vρg .
    • In general, the buoyancy force on a completely submerged object is given by the formula:
    • The buoyancy force on the cylinder is equal to the weight of the displaced fluid.
    • The buoyancy force on an airship is due to the air in which it is immersed.
    • Identify factors determining the buoyancy force on a completely submerged object
  • Gas Vesicles

    • Gas vesicles are spindle-shaped structures that provide buoyancy to cells by decreasing their overall cell density.
    • Gas vesicles are spindle-shaped structures found in some planktonic bacteria that provides buoyancy to these cells by decreasing their overall cell density .
    • Positive buoyancy is needed to keep the cells in the upper reaches of the water column, so that they can continue to perform photosynthesis.
    • They provide more buoyancy per unit of protein than narrow gas vesicles.
  • Buoyancy and Archimedes' Principle

    • The reasoning behind the Archimedes principle is that the buoyancy force on an object depends on the pressure exerted by the fluid on its submerged surface.
    • The buoyancy force on this amount of fluid must be the same as on the original object (the ship).
    • However, we also know that the buoyancy force on the fluid must be equal to its weight, as the fluid does not sink in itself.
    • Therefore, the buoyancy force on the original object is equal to the weight of the "displaced fluid" (in this case, the water inside the dashed region (b)).
  • Flotation

    • An object floats if the buoyancy force exerted on it by the fluid balances its weight.
    • An object will float if the buoyancy force exerted on it by the fluid balances its weight, i.e. if FB=mgF_B = mgF​B​​=mg.
    • Express the relationship between the buoyancy force and the weight for a floating object
  • Cerebrospinal Fluid and Its Circulation

    • Buoyancy: The actual mass of the human brain is about 1400 grams; however, the net weight of the brain suspended in the CSF is equivalent to a mass of 25 grams.
    • The brain therefore exists in neutral buoyancy, which allows the brain to maintain its density without being impaired by its own weight.
  • Weight

    • In this case, the weight of the object varies due to the force of buoyancy.
  • Vesicles and Vacuoles

    • Vesicles are involved in metabolism, transport, buoyancy control, and enzyme storage.
  • Static Equilibrium

    • This force which counteracts the weight of a region or object within a static fluid is called the buoyant force (or buoyancy).
  • Plant Adaptations to Life on Land

    • Water also provides buoyancy to organisms.
  • Geomagnetism

    • The motion of the molten outer iron core is sustained by convection, or motion driven by buoyancy.
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