[Answer] 4. After the Hindenburg explosion, which inert gas replaced the hydrogen that had been used previously by many dirigibles?

Step 1 : Introduction to the question "4. After the Hindenburg explosion, which inert gas replaced the hydrogen that had been used previously by many dirigibles?"

...1. Argon 2. Neon 3. Carbon Dioxide 4. Helium While the exact cause of ignition of the 1937 Hindenburg explosion will likely remain unknown, the hydrogen used for fuel on the airship was highly flammable as can be seen on newsreels of the time. Later airships used helium, an inert gas much less likely to cause such a disaster. There were later dirigible-type airships using helium that crashed but none of them caught fire or exploded. There were also some dirigibles flying at the same time that did use helium but it was hard to obtain and thus hydrogen was used with fatal results.

Step 2 : Answer to the question "4. After the Hindenburg explosion, which inert gas replaced the hydrogen that had been used previously by many dirigibles?"

Helium:

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