how much Hellium is req'd to fill a 2ft diam ball?

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how much Hellium is req'd to fill a 2ft diam ball?

ball has to rise to 500ft & stay aloft for 48 hrs minimum,what type of rubber baloon can i use

2007-01-20 23:15:35 · 2 answers · asked by gordon p 1 in Science & Mathematics ➔ Engineering

2 answers

You need to know the weight of the ball. Helium will lift about .08 pounds per cubic foot. (I think that's the number) Look up the density of air and subtract the density of Helium.

2007-01-21 03:03:25 · answer #1 · answered by rscanner 6 · 0⤊ 0⤋

2x as much as need to fill 1/2 of the ball

2007-01-20 23:20:40 · answer #2 · answered by bill 2 · 0⤊ 0⤋