Hydrogen, until the Hindenburg,then everyone realized that "Hey, Hydrogen isn't that safe to use!"
Hot air balloons, you mean?? Just air that is hot.
Actual hand balloons and such? Helium or again, just air. Helium floats better because it is lighter than the surrounding air around it. Helium and air are still used in both.
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Hydrogen was used in air balloons at older times. but at present we use helium gas in air balloons . helium is an inert gas.
There are two gases that are lighter than air, most commonly Helium is used in balloons because the other gas, Hydrogen is explosive.
Helium gas is commonly used to fill party balloons because it is lighter than air, making the balloons float.
Helium gas is commonly used to fill party balloons as it is lighter than air, which causes the balloons to rise and float.
inert gas.
Helium is commonly used to fill balloons. It is non-flammable and lighter than air, allowing balloons to float.
Helium is a colorless, odorless, and tasteless inert gas that is used in various applications such as in balloons for parties and in cryogenics for cooling superconducting magnets.