Depends on the temperature.
Yes, ozone is lighter than air.
Anhydrous ammonia is lighter than air, with a specific gravity of 0.597 compared to air. This means that it will tend to rise and disperse in the air if accidentally released.
Without having the information about what the options are there really is not any way to know which is lighter than aircraft. The rest of the information needs to be provided for the correct answer to be given.
Magnesium is denser than air, so it will sink in air rather than float.
Yes, propane is lighter than air. It has a density of approximately 1.88 kg/m³ (0.1179 lb/ft³) which is lighter than the density of air, which is about 1.225 kg/m³ (0.0765 lb/ft³). This is why propane tends to rise and disperse in the atmosphere.
Yes, ozone is lighter than air.
HYDROGN IS 14 TIMES LIGHTER THAN AIR.
100% of hydrogen is lighter than air
Yes methane is lighter than air because it is less dense than air.
blimp or hot air balloons are lighter than air crafts
Hot air, hydrogen or helium are lighter than cold air.
"Lighter than air." Think about it for a second.
There are many, but one is Helium
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.
it means that it is a flying device that is lighter than air.
Helium is lighter than air
Hot air, hydrogen or helium are lighter than cold air.