Physics
Ice is packed in saw dust because

Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.

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Physics
A balloon filled with hydrogen will

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

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