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helium is the lightest air

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14y ago

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Was helium the lightest gas?

Hydrogen was, and is, the lightest gas


Lightest inert gas?

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Is helieum a gas?

Not only that, but it's one of lightest, or possibly the lightest, gas in the world. I'm a nerd, so you can trust me.


Which is the lightest gas in the air?

Hydrogen gas is the lightest. With a formula of H2, it has an atomic mass of only half that of helium. It is highly reactive and there isn't much of it just floating around by itself. Plus, because it is so light, it just floats right up out of our atmosphere and into space.


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Helium


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Technically Helium is classed as a Noble gas and has a MW of 4g/mol.


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Helium is the lightest non-flammable gas. It is colorless, odorless, and tasteless, making it safe for a variety of applications such as lifting balloons and as a coolant in various industries.


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Photons (quanta of light) are believed to have zero rest mass, and so would qualify as the lightest objects.The current experimental upper bound for the mass of a photon is 10-18 eV/c2, or (in S.I. units) about 10-54 kg.


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