Despite the danger of using flammable hydrogen, no alternative gases that could provide sufficient lift could be produced in adequate quantities.

This is highly flammable hydrogen.

So, in what ultimately proved a fatal decision, the Hindenburg was filled with flammable hydrogen.

But this is a scientific analysis of the disaster, one that goes beyond blaming the flammable hydrogen that filled the zeppelin.

Like other airships of that age, it was filled with flammable hydrogen.

This ensures that the highly flammable hydrogen does not mix with oxygen in the air.

He originated the idea of using inert helium rather than flammable hydrogen and made use of his leadership abilities in organising its manufacture.

We didn't, so they had to use highly flammable hydrogen.

He would contain the flammable hydrogen inside chambers made of advanced composite materials filled with oxygen-consuming bacteria to reduce fire risk.

Those behemoths were made of stretched canvas over a heavy steel frame, and were stuffed with bags of highly flammable hydrogen.