Physics
Ice is packed in saw dust because

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

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Physics
Absolute Zero is defined as

At which the volume becomes zero
The temperature at which all molecular motion ceases
At which liquid Helium boils
At which water boils at 298K

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