Helium gas can be widely used to baby's funny toys, such as balloon. also it has safe advantage than other gas in usage.

Helium gas, the very light gas that makes balloons and airships float in the air. Helium has an important safety advantageit cannot burn or explode like hydrogen. It is also a vital part of air mixtures for breathing by deep-sea diversunlike nitrogen, it hardly dissolves in blood or lipids (fatty compounds) even at high pressures

Helium Balloons work by the law of buoyancy. As long as the helium plus the balloon is lighter than the air it displaces, the balloon will float in the air. Helium is a lot lighter than air.

Helium Balloon Gas makes balloons float. Helium is lighter than air and just as the heaviest things will tend to fall to the bottom, the lightest things will rise to the top.