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
Absolute Zero is defined as

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

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