Write a few lines on the utility of hydrogen as a fuel ?

1) The heat of combustion of hydrogen is high. Hence hydrogen is used industrial fuel.
2) The energy released by the combustion of dihydrogen is more than the petrol.
3) Atomic hydrogen and oxyhydrogen torches are used for welding and cutting of metals.
4) Hydrogen is used as rocket fuel.
5) Hydrogen also used in fuel cells for generating electrical energy.
6) Hydrogen is major constituent in fuel gases like water gas, producer gas and coal gas.