Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and start coming down

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in weight
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in height
Weight of the balloon is less than the weight of air displaced by it.

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