A ballon filled up with gas would only go up in air it is filled up with a gas whose density is lowwe than air
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Natural gas or Methane is also lighterthan air, not because it contains helium, which most of it does not, but because it is just less dense than air. Itcan be used to fill balloons, but it suffers from the same flammability and explosion hazard as hydrogen.
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what's the question.. That gas would be Helium.. Hope it helps bcoz helium density is lower than air
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