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.
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.
It takes about 300 balloons to lift 200 pound manballoon filled with exactly 1 sq ft of helium yields about 28.2g (upward thrust)453.6 grams/Lb453.6(1Lb) /28.2= about 16 blnsSo to get one pound off of the ground it would take about 16 balloons16x200= 3200it would take 3200 balloons to lift a 200 lb person....Only hoover not continually rise on account of the uneven weight distribution and the temp differences in each balloon helium isn't as buoyant when cold, unless the temp is consistant. Wind is a factor; as well as the amount of static charge in the air
Helium is used in cryogenics, in deep-sea breathing systems, to cool superconducting magnets, in helium dating, for inflating balloons, for providing lift in airships and as a protective gas for many industrial uses (such as arc welding and growing silicon wafers). Inhaling a small volume of the gas temporarily changes the timbre and quality of the human voice.
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