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Q & A: Lifting with Helium

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Most recent answer: 10/22/2007
Q:
OK you can make some thing float with helium ok i have a rocket i need to float how much helium will it take to float an object say per gm? the baloon has a volume of 28295.8367 cm^3 how much will it float?
- Ellison (age 16)
Burkburnett TX
A:
According to the paragraph on helium in my CRC Handbook of Chemistry and Physics, 1000 cubic feet of helium in a balloon (presumably not under huge pressure, but around one atmosphere) will lift 68.5 pounds at sea level. Your balloon has a volume very close to one cubic foot, so it can exert a lifting force of 0.0685 pounds or about 1.1 ounces, minus the weight of the balloon material.

Tom

(published on 10/22/2007)

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