Physics
A dynamo is used to convert

Magnetic energy into mechanical energy
Electrical energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into magnetic energy

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Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
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.

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