Physics
Fat can be seperated from milk in a cream seperator because of :

Gravitational Force
Centripetal Force
Centrifugal Force
Cohesive Force

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Physics
Inside an aeroplane, flying at a high altitude,

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

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