This survey focuses on the use of liquid hydrogen as an automotive fuel in comparison with the use of compressed gaseous hydrogen. The energy penalties associated with liquefaction versus gas compression are compared, followed by an examination of the weight of hydrogen relative to carrier weight for the two alternative approaches. The optimum form and design of LH2 tanks are discussed, followed by the important topic of how to achieve quick and easy transfer of LH2 from a storage tank to a vehicle.
