On this lightly loaded flight, indeed, only six of the ten gas cells contained helium; the remaining four were full of air.

For a reduction in narcotic effects trimix or heliox, gases which also contain helium, are generally used by divers.

Rockets they were, containing helium compressed to within an inch of its life.

Stratification is more pronounced with blends containing helium, but can also lead to inaccurate analysis of Nitrox blends.

Dry suits should not be inflated with gases containing helium as it is a good thermal conductor.

That shows it contains helium.

One of these lamps is a neon tube and the other a tube containing mercury vapour and helium.

Its atmosphere contains hydrogen, helium and methane.

Working the earlier example, for a gas mix containing 40% helium being used at 200 feet, the END is:

All five of the balloons are hybrid types known as Roziers, which obtain lift from separate cells containing helium and hot air.