Helium is less dense than air, and therefore the balloon will float.
helium balloons
Helium
the use for balloons mostly
If you want the balloons to float, you would probably use helium.
Helium
Helium to get them to float.
it can be used to fill helium balloons
Helium is used for inflating balloons and dirigible airships.
helium is generally filled in helium balloons
Helium
HELIUM
Helium is an inert gas."They fill Helium in the balloons", father explains his child.