Any gas- but if you want them to SAFELY float, use helium.
Helium gas is commonly used to fill party balloons because it is lighter than air, making the balloons float.
If you want the balloons to float, you would probably use helium.
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.
element
An example of a gas element is helium, which is a noble gas commonly used in party balloons and airships.
Helium gas , because helium is the most inert element of all, and does NOT ignite, and allows balloons to float. If carbon dioxide was used, then the balloons would fall to the floor. Hydrogen is NOT used , because it is flammable and explosive, when mixed with air.
They are filled by Hydrogen gas.
helium
Helium is used in blimps and balloons. It is the second lightest element to hydrogen, which is not used because it is highly flammable.
Helium molecules have a lower molecular weight than air. This is why balloons filled with Helium will float in the air. Apex:element
Helium
to keep the balloon floating