Hydrogen is only something like 8% better for lifting than helium because they are both much lighter than air: * https://en.wikipedia.org/wiki/Lighter_than_air

Hydrogen is only something like 8% better for lifting than helium because they are both much lighter than air: * https://en.wikipedia.org/wiki/Lighter_than_air#Hydrogen_and_helium https://en.wikipedia.org/wiki/Lighter_than_air#Hydrogen_and_... Agreed that the danger of hydrogen is less than perceived. In an accident it goes up which is normally where the people are not. When it burns it doesn't create much radiant heat. Outdoors in the daytime firefighters have to use something like a broom to find hydrogen fires. Otherwise you could just walk right by one ... which is an issue if you instead walk right into the fire.