helium
Helium gas is commonly used to fill party balloons because it is lighter than air, making the balloons float.
Helium
to keep the balloon floating
Helium.
Helium.
If you want the balloons to float, you would probably use helium.
helium
helium
Hydrogen
Helium is the noble gas used in party balloons and weather balloons because it is lighter than air. Its low density makes it ideal for filling balloons as it provides buoyancy without adding much weight.
Helium is the most used gas for balloons; sometimes hot air and rarely hydrogen.
In balloons, it is desirable to use the lightest possible gas. Nitrogen is a relatively heavy gas with Atomic mass no. of 14. Instead, a much lighter gas, Helium, is used. It has an Atomic mass no. of 4. Hydrogen was used a long time ago, since it was the lightest gas. But due to its explosive nature, it is no longer used.