Hydrogen was once used to fill airships. Quite dangerous due to how flammable it is.
That'd be hydrogen.
Hydrogen and helium are two elements that are kinda-sorta interchangeable in airships.
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed that Hydrogen gas was too dangerous(it is extremely flammable) to be used. Since then, Helium has been used instead. Helium is also a very light element, and is completely safe, as it is inert.
because hydrogen used to be in those airships and since hydrogen is flammable it was very dangerous
Helium is typically used to fill airships and balloons due to its low density, which allows them to float in the air.
Hydrogen was the gas that was once used to filled airships. It is extremely plentiful and easy to produce. However, it is also extremely flammable and caused a few accidents. Helium is now used.
An example of a gas element is helium, which is a noble gas commonly used in party balloons and airships.
Hydrogen (explosive), Helium (non-explosive).
Hydrogen used to be used in airships.
gas is still used in airships to provide lift.
Goodyear is well known for its blimps. In order for these blimps to float, they contain a lighter than air gas. Hydrogen is to dangerous for this purpose, so helium is used. Thus, helium is the noble gas used by Goodyear.
Helium has the chemical symbol He. It is a noble gas that is lighter than air and is commonly used in balloons and airships due to its low density.