Inside an aeroplane, flying at a high altitude,
  • 1the pressure is the same as that outside.
  • 2normal atmospheric pressure is maintained by the use of air pumps.
  • 3the pressure inside is less than the pressure outside.
  • 4normal humidity and partial vacuum are maintained.
Answer:- 1
Explanation:-

Solution:
normal atmospheric pressure is maintained by the use of air pumps.

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