Physics
The oil in the wick of lamp rises due to

Pheonomenon of capillarity
Low viscosity of oil
Pressure difference
Force of cohesion

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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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