Party Helium 'Smartop' Cylinder

Since it’s lighter than air, gaseous Helium is widely used to fill up balloons (leisure balloons, airships, sounding balloons for weather forecasts, etc.).
It also enables to quickly evacuate heat and serves as a protective atmosphere for fiber optics and semi-conductors manufacturing.
Since its diffusion is very fast, Helium is used to fill up airbags right after the impact.