Hydrogen, helium, ammonia, methane, neon, coal gas and pure nitrogen are all lighter than air. A pocket of air can be made lighter than the surrounding air by heating it. Continue Reading.
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New Cub Cadet Challenger 400LX, 2016, yellow in color, Subaru EX40 Air cooled engine, 404cc, 2WD, 0-25 mph, enclosed CVT shafter transmission, 5 gallon fuel tank, windshield, roof, aluminum alloy wheels, LED lights, sport style seats with headrests, glove box, digital dash with speedometer, 500 l...