Physics
A balloon filled with hydrogen will

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

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high

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