Physics
A balloon filled with hydrogen will

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

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Physics
A hydrogen balloon floats up because of

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

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