helium is the lightest air
Helium
helium
Yes, it is.
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.
Technically Helium is classed as a Noble gas and has a MW of 4g/mol.
Hydrogen was, and is, the lightest gas
Helium
helium
Yes, it is.
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.
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.
helium
Helium
Technically Helium is classed as a Noble gas and has a MW of 4g/mol.
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.
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.
The lightest weight element that is not a gas at room temperature is lithium. It is a solid metal with a low density and atomic number 3.