Helium. An inert colourless gas, one-sevcnth of the weight of air. It is preferable to hydrogen for use in airships because it is non-inflammable.
Helium is a noble gas, which means that it does not bond well with other elements. This has led to helium having a number of uses such as the pressurizing gas for rocket fuel tanks, coolant for...
Gray of the (United States Army Air Corps) in a helium balloon. Gray dies when he exhausts his oxygen.
1931-27 May 1931-15.787 km (51,790 ft)-Auguste Piccard & Paul Kipfer in a hydrogen balloon.
1932-16.
666 for helium, to 1.4 for air, to 1.0 for cool liquid water. It's ironic that the correction is actually smaller for air (which has a high compressibility) than it is for water (which has a much lower compressibility).
Robinson also makes emergency pop-out floats, where the floats are packed very tightly on the skid, but can be inflated by a bottle of helium if the pilot pulls the emergency inflation lever.
Dirigibles are also known as airships or blimps. The gas in dirigibles, helium, is lighter than air and is not flammable, as the Hindenburg disaster proved that airships and flammable gases is not a good idea.
which (c) will permit the control car and even the power cars to be built within the hull; (d) even fuller accessiblity to continuous inspection and permitting repairs to be made even in flight; (e) the use of new fuels to conserve helium and reduce ...
 See also: Aircraft, Flight, Speed, Lift, Altitude
  
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