Helium is much lighter than air: it has about one-eighth the density of air. Because hydrogen has a density roughly one-sixteenth that of air, it will float in air and will actually float upwards. You'd think that hydrogen would be a better gas because it provides somewhat greater lift than helium due to its lesser weight. Although hydrogen is lighter, it reacts violently with oxygen. That was one of the causes of the Hindenburg accident. At normal temperatures, helium is totally inert. Using helium will keep any incidents at bay. We always start the magic show at our institution by lighting hydrogen-filled balloons. Because the explosion is so large, everyone constantly assumes it's a bomb or something. Although hydrogen is lighter than air, it is combustible, and because oxygen is present in the air, there is a risk of explosion and fire. Helium is a non-combustible gas that is lighter than air and is used to fill balloons.
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