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Ballonet. A compartment within the envelope of a balloon or airship into which air can be blown to counteract changes of volume of the gas in the envelope.
324 is contained in a single bag, but an inner two compartment bag, called the ballonet, is filled with air to keep the main container properly distended because the air pressure can be made to compensate for variations in gas pressure in the bag.
 See also: Airship, Aircraft, Navigation, Speed, Motor
  
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