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Because its only partly air.
What else can I help you with?
Are solvents heavier than air?
Yes solvents are heavier than air
Is Nitrous Oxide lighter or heavier than air?
Nitrous Oxide is heavier than air.
Is argon heavier then air?
Yes, argon is heavier than air. Argon has a higher density than air, so it will sink below the air in the atmosphere.
What is heavier than air flying craft?
"Heavier than air" refers to airplanes.
Which is a heavier-than-air flying craft?
An airplane is a heavier than air flying craft
Is LP gas heavier than air?
Yes, LP gas is heavier than air.
What kind of air is heavier than another type of air?
Gas is heavier than oxygen. Cold air is heavir than hot air
Why are aircraft categorized into heavier-than-air and heavier-than-air vehicles?
One is lighter and the other one is heavier. :D
Why are aircrafts categorized into heavier-than-air and lighter-than-air?
they are heavier than air hence why they don't fly unless in motion.
Which craft is a heavier-than-air flying craft?
An airplane is a heavier than air flying craft
Is LP heavier than air?
Yes, LP (liquefied petroleum gas) is heavier than air.
What is the difference between lighter than air vehicles and heavier than air vehicles?
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.
