Physics
A balloon filled with hydrogen will

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

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
Two waves overlap

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Physics
Ice is packed in saw dust because

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

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