Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
the pressure inside is less than the pressure outside.
the pressure is the same as that outside.
normal atmospheric pressure is maintained by the use of air pumps.

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Physics
Ice is packed in saw dust because

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

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