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What is the buoyant force exerted on the balloon in air

  1. Jun 23, 2005 #1
    Is this a correct interpretation of Archimedes Principle for this application?

    A balloon is filled with helium (density = .02 kg/m^3) and has a volume of .009 m^3. What is the buoyant force exerted on the balloon in air
    (density = 1.3 km/m^3)?

    Fb = (1.3 km/m^3)x (.009 m^3) x (9.80 m)

    = .115 N

  2. jcsd
  3. Jun 23, 2005 #2

    Doc Al

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    Staff: Mentor

    Yes. Archimedes' Principle says that the buoyant force on an object equals the weight of the displaced fluid.
  4. Jun 23, 2005 #3


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    Nitpick! Mass is measured in kg, not km. The latter is a measure of distance.
  5. Jun 23, 2005 #4
    Ya.. Eng67, u'r units are all wrong
    Unit for density: [tex] kg/m^3 [/tex]
    Unit for gravity: [tex] m/s^2 [/tex]
  6. Jun 24, 2005 #5
    Thanks for the help Guys. I just typed in Km instead of Kg.
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