Depends on the temperature.
It depends on the specific compound, though most are denser than air.
No, unless shaped as a boat, and no.
humid air is lighter that an equal volume of dry air at the same temperature.
Hydrogen is lighter than air. As to the temperature it depends on where the heat source is, hydrogen can either be warmer, cooler or the same temperature as air
regular (silica) aerogel is not lighter than air but SEAgel is a form of aerogel that is lighter than air
The balloon is lighter than air.
100% of hydrogen is lighter than air
Yes methane is lighter than air because it is less dense than air.
No Argon is not lighter than air. Argon is 25% more dense than air.
blimp or hot air balloons are lighter than air crafts
Hot air, hydrogen or helium are lighter than cold air.
Hot air, hydrogen or helium are lighter than cold air.
"Lighter than air." Think about it for a second.
Hydrogen and Helium are both lighter than air.
Just, simply, Lighter than Air Vehicles are lighter than air, so that makes them fly, and Heavier than air vehicles are heavier than air, but they use airfoils on the wings to fly.
HYDROGN IS 14 TIMES LIGHTER THAN AIR.
Natural gas is lighter than air and rises.