#balloon  large tough non-rigid bag filled with gas or hot air
  supertype:  #lighter-than-air_craft  aircraft supported by its own buoyancy
  part:  #gasbag  #ripcord.cord
  subtype:  #hot-air_balloon__hotairballoon  balloon for travel through the air in a basket suspended below a large bag of heated air
  subtype:  #meteorological_balloon  a small unmanned balloon set aloft to observe atmospheric conditions
     subtype:  #pilot_balloon__pilotballoon  meteorological balloon used to observe air currents
  subtype:  #trial_balloon.balloon__trialballoon  a balloon sent up to test air currents

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