Oxygen o2 only is slighty heavyer than air. o3(ozone) is around the same weight as o2 ,but the ozone layer is at a hiegher altitude because it is created when o2 come in contact with high amounts of UV rays.
Nitrous Oxide is heavier than air.
hydrogen
Some are heavier, but some are lighter. For example, methane rises but propane sinks.
Dry air is heavier than wet air because water vapor is less dense than the other components of dry air, such as nitrogen and oxygen. When moisture is added to the air, it displaces some of the heavier components, making wet air less dense and therefore lighter.
No. Helium is 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.
Helium is lighter than air
Nitrous Oxide is heavier than air.
Moist air is heavier than dry air, because of the water.
One is lighter and the other one is heavier. :D
hydrogen
No, it is heavier than air and will sink to the floor.
Some are heavier, but some are lighter. For example, methane rises but propane sinks.
they are heavier than air hence why they don't fly unless in motion.
one is lither
"Lighter than air" aircraft are lighter than air! The most common are blimps. They do not rely on wings to generate lift. They contain a lighter than air gas (ex:helium) that lifts the craft into the air when ties to the ground are released. "Heavier than air" aircraft are the opposite. They rely on wings to generate lift to get into the air. Common heavier than air aircraft are general airplanes you see in the sky everyday.
Dry air is heavier than wet air because water vapor is less dense than the other components of dry air, such as nitrogen and oxygen. When moisture is added to the air, it displaces some of the heavier components, making wet air less dense and therefore lighter.