Why is helium used in airships instead of hydrogen?
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Today helium is used instead of hydrogen, since it is inert so non-flammable which makes things a lot safer. Hydrogen can ignite very easily when mixed with the oxygen of the surrounding air. In party balloons and were people are in direct contact with the "thing" be it a balloon or even an airship helium is the safer choice.
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Explanation:
The two primary lifting gases used by airships have been hydrogen and helium. ...
Helium's non-flammable nature makes it the only practical lifting gas for manned lighter-than-air flight, but it is scarce and expensive, and the use of helium can reduce a rigid airship's payload by more than half.
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