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Balloons and Blimps are lighter-than-air aircraft, which float in the sky. Inside the balloon compartment is a lighter-than-air gas such as helium or hydrogen. Due to the fact that hydrogen is lighter than oxygen, the hydrogen wishes to rise and in doing so floats the balloon upward.
from: http://ezinearticles.com/?Smart-Dust-in-Balloons-and-Blimps&id=74945
