| A survey is made of the development, production and storage of cryogenic liquid hydrogen (LH;Gaseous hydrogen (GH;The basic economics of LH;Social, medical, psychological, technological, economic and environmental reactions to the general adoption of the Hydrogen Economy Era are briefly discussed.;Finally, the economics of liquid hydrogen production, storage, distribution and operation, in particular, as a future high energy fuel for subsonic transport aircraft, are reviewed. (Abstract shortened by UMI.). |