generally, you can look at the Periodic Table of Elements.
hydrogen is the lightest of both
Hydrogen gas has the lightest density of any liquid.
no, the lightest liquid has a lot more density than the heaviest gas.
Hydrogen was, and is, the lightest gas
Hydrogen is the lightest gas.
Yes it is, and it's also the lightest gas in the universe.
No, water is not the lightest liquid on Earth. Liquid hydrogen and liquid helium are lighter than water because they have lower densities.
gas is the lightest in weight
helium is the lightest air
Hydrogen is the lightest gas found in air.
the lightest gas is hydrogen
hydrogen
Helium