Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water

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Physics
Ice is packed in saw dust because

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

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