SunHydrogen Inc (HYSR)

[tjusa02]

The biggest issue with using Hydrogen as a fuel is space. Using gasoline as an example, because that was the number I could quickly find, Hydrogen has an energy per unit mass of 61,100 BTUs per pound vrs 20,900 BTUs per pound of gasoline. However a gallon of gas weighs 6 pounds thus providing 125,400 BTUs, while liquid hydrogen only weighs .567 pounds per gallon with 34,643 BTUs. For use in a modified car or jet engine you need 3.6 gallons of liquid hydrogen to equal 1 gallon of gasoline. Now that is a big tank, making it impractical for cars, but possibly for planes, trains and ships

I'll see if I can find a more complete table for comparison.