AirFish

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Revision as of 09:21, 24 January 2008 by Root (Talk | contribs) (New page: Category:Engineering === Lift of balloon === # The volume of a sphere is 4/3 * pi * r3, where r is the radius of the balloon. # One cubic foot of helium will lift about 28.2 grams, ...)

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Lift of balloon

  1. The volume of a sphere is 4/3 * pi * r3, where r is the radius of the balloon.
  2. One cubic foot of helium will lift about 28.2 grams, so multiply the volume of the balloon by 28.2.
  3. Divide by 448 -- the number of grams in a pound -- to determine the number of pounds it can lift.