Hydrogen (explosive), Helium (non-explosive).
Helium
helium
Helium
A capstan is a spool around which ropes are wound while lifting weights.
The * selector is used to match any element in the hierarchy.
lead
lead
Helium
Hydrogen was once used to fill airships. Quite dangerous due to how flammable it is.
Helium
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.
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.
Hydrogen used to be used in airships.
gas is still used in airships to provide lift.
Generally , they have to be light and strong materials . In airships , aluminum is used because it's light, strong and resistant to corrosion. In air balloons , i think strong rubber made of a material with a high melting point so that it doesn't melt at high temperatures inside the balloon is used, as well as fabric ouside.
Tungsten
Lifting light loads.
Lifting light weight with high intensity can stunt growth in children if used too early.