heliumfilled
Helium-filled describes items that have been inflated with helium gas. Helium is a colorless, odorless, non-toxic noble gas that is lighter than air. When enclosed, helium provides buoyancy, allowing objects to float. Its chemical inertness and very low density make helium-filled configurations useful in both decorative and technical contexts. Unlike flammable gases such as hydrogen, helium does not support combustion, adding a safety advantage for lift applications.
Common uses include party and promotional balloons, weather and research balloons, and lighter-than-air craft such as
Helium-filled systems face practical constraints. Helium atoms diffuse through many materials, so leaks are possible and