# AirFish

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Revision as of 10:21, 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, ...)

### 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, so multiply the volume of the balloon by 28.2.
- Divide by 448 -- the number of grams in a pound -- to determine the number of pounds it can lift.