Physics
If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is

Height of the liquid column
Density of the liquid
Surface area of the bottom of the vessel
Acceleration due to gravity at the bottom of the vessel

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Physics
A balloon filled with hydrogen will

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

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