Question

Why hydrogen can't be used as a fuel?

Answer 1

Answer:

First, hydrogen is not as energy-dense as other fuels, meaning that you need a whole lot of it to do a little bit of work. ... Fuel cells are far more efficient than internal combustion engines, and a hydrogen fuel cell has cleaner emissions than an internal-combustion hydrogen engine

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Answer 2

Answer:

hydrogen doesn't occur from nature, it has to be extracted, then compressed in fuel tanks