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With a good oxidizer present, extremely flammable and its IUPAC hazard symbol gives it a rating of “4” for flammability, which is the highest possible rating. If you poured liquid H2 onto a flame in the open air, it would likely burn spectacularly. Liquid oxygen and liquid hydrogen were actually been used to power the space shuttle’s main thruster.
As flamable as gasoline.
Source(s): http://www.youtube.com/watch?v=ydEkV-E0mP8&list=PL…
http://www.youtube.com/watch?v=65KIexy4New&feature…
explosive