Physics
RADAR is used for:

locating submerged submarines.
locating geostationary satellites.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.

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Physics
Inside an aeroplane, flying at a high altitude,

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

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