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Ok,I found that the Hindenburg had a capacity of about 7,063,000 cubic feet / 211,890 cubic meters of hydrogen (at 1 atm).The density of hydrogen is 0.005229 lb/ft3 (0.08376 kg/m3) (at 68°F; 20°C, 1 atm)211,890 m* 0.08376 kg/m= 17748 kg of hydrogen.From the periodic table, hydrogen has an atomic weight of 1. Oxygen has an atomic weight of 16. Thus water (HO) has an atomic weight of 2+16=18. The ratio of water to hydrogen would be 18/2.So, 17,748 kg hydrogen * (18/2) --> about 159,732 kg of water, or, assuming complete combustion.The water would be formed as a vapor as the combustion temperature would have far exceeded the boiling point of water. As it would cool in the atmosphere, it could condense and fall as rain, but over a greater area than just the airport.Here is a comparison in sizes of the Hindenburg to a Boeing 747, and the Titanic from the link above. It kind of puts the name "airship" into perspective.