If a balloon filled with Helium had a 3 foot diameter, how many cubic feet of gas would be in it? Also how much weight would that balloon be able to lift? (How many pounds?)
2007-12-27 07:24:23 · 3 answers · asked by ? 4 in Science & Mathematics ➔ Physics
Sorry but I dont get it. (In english please) :-) Thanks
2007-12-27 07:37:03 · update #1
If the balloon is shaped like a sphere, its volume is about 400 liters. If another responder's numbers are correct, the balloon should be able to lift about 1.11 kg per cubic meter, which means your 3-foot balloon should be able to lift about 1 pound (including the weight of the balloon itself).
Some factors complicate this. For example, this assumes that the pressure of the helium is 1 atmosphere, which will not be the case in a rubber balloon, because the tension in the rubber will compress the helium. The net effect is a reduction in the lifting power. But in any case, you should not expect to lift more than 1 pound per 3-foot balloon.
2007-12-27 07:51:16 · answer #1 · answered by RickB 7 · 4⤊ 0⤋
Just search it on google, but I imagine it is a lot.
2016-05-27 04:40:37 · answer #2 · answered by nydia 3 · 0⤊ 0⤋
Volume is
V= 4/3 pi r^3
pi= 3.1459...
r - radius of the balloon (1.5 feet)
V= 4/3 pi (1.5)^3
V=14.1 ft^3
V= 0.40m^3
Max weight is
W=g(p(air) - p(He))V
g- acceleration due to gravity
p(air) -density of air
p(He) - density of Helium
refer to problem (part 1)
m= W/g= g(p(air) - p(He))V/g
m=(1.292 - 0.1786)0.40
m= 0.45kg or
m= 0.98 pounds
2007-12-27 07:35:33 · answer #3 · answered by Edward 7 · 3⤊ 3⤋