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 is the lightest air
The lightest gas in the universe is probably hydrogen having atomic mass 1 u.(approx).
Hydrogen
Helium
helium
helium is the lightest air
The lightest gas in the universe is probably hydrogen having atomic mass 1 u.(approx).
Hydrogen was, and is, the lightest gas
Yes it is, and it's also the lightest gas in the universe.
gas is the lightest in weight
hot air
generally, you can look at the Periodic Table of Elements. hydrogen is the lightest of both
the lightest gas is hydrogen
hydrogen
Hydrogen
Helium
helium