10000000 helium balloons
it took 53 12" helium balloons to lift a pound, you have to add the weight of the string and balloons
depends on how large the balloon is! ;D
depends on how large the balloon is/ how light the human is!
you need to give dimensions (volume), find the lift given by one cubic inch of helium and find out from there.
Depends on the weight. Check the MythBusters website, they did an experiment on this.
1 cubic meter helium lifts 1 Kg weight at sea level.
this is a guess i think it would take about 7 with helium in
A normal helium balloon can lift approximately 14 grams. As a result, lifting 5 pounds (about 2268 grams), would require over 162 balloons. Note, however, that this is an estimate and may vary between different balloon types made by different manufacturers, as well as by how fully the balloon is inflated.
they are used in many different types of balloons such as party balloons and hot air balloons.
because so many kids have let go of their helium balloons , so the plantes just sucked in the helium from the balloons and that's why most of the plantes are made of helim :)
25 Balloons (Approx.)(I might be wrong as I am not sure)
depends how big the helium balloon is and how many
258 helium filled balloons filled to 34 psi each
because heluim a gassic liquid that comprees therefore you can fill many baloons with heluim
The mass the balloons can lift depends on the mass of the air displaced by the balloons.Mass lift-able + mass of balloons = total mass of air displaced.Mass of balloons = Total Volume X Density of heliumMass of air displaced = Total volume X Density of air.Density of helium = 1.79 X 10^(-4) Kg/m^3 No: 0.1786 kg/m3 (0 °C, 101 kPa)Density of air = 1.2 Kg/m^3 No: dry air has a density of 1.28 kg/m3 (0 °C, 101 kPa)1 pound = 0.45 KgVolume = Mass lift-able/ (air density - helium density)= 0.45/(1.2 - 1.79X10-4) = 0.38m^3. No: 0.454/(1.28 - 0.179) = 0.412 m3You will need enough helium balloons to cover a total volume of about at least 0.4m^3. This assumes that the temperature of the helium and the air is room temperature. I don't know what sized balloons you are considering, but we can say that:No. of Balloons = total volume/volume per balloon.If you use roughly spherical balloons of radius 10cm, then the volume per balloon is about 0.004m^3, and the number of balloons needed is about 100. But as i said, without knowing the size of the balloons you intended, i cant really say how much you would need.