I think it is helium, I could be wrong.
If you want the balloons to float, you would probably use helium.
Dihydrogen gas (H2) is highly flammable and poses a safety risk in balloons. The use of helium, which is non-flammable, is preferred in modern balloons to avoid the risk of fire accidents.
It is not possible to inflate balloons with rotten bananas because the decomposition process releases gas that could be harmful if inhaled. It is recommended to use a pump or a helium tank to fill up balloons.
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.
Helium is a gas used to inflate lighter than air balloons.
Helium
Helium to get them to float.
Helium
Helium gas is commonly used to fly balloons due to its lighter-than-air properties. It is non-flammable and safe for use in balloons to provide the lift needed for them to float in the air.
Helium is the safest gas to fill in balloons, as it is light and noncombustable.
Any gas- but if you want them to SAFELY float, use helium.
If you want the balloons to float, you would probably use helium.
gas tank, plastic, wood
They Do Not use Hydrogen gas to fill up balloons. People use Helium gas to fill up balloons (ordinary party balloons, and big working balloons such as the one used by Goodyear). Helium is Not Flammable. Hydrogen is Flammable and has as tendency to burst into Flame, similar to the German Blimp/Dirigible Hindenburg. Since the US Navy lost Two Helium Blimps in Bad weather; The Akron and the Shenandoah (with a great loss of lives), the US Navy almost never uses Blimps anymore.
Hot air balloons typically use propane gas as a fuel source for the burner that heats the air inside the balloon envelope. The propane is burned to heat the air, which causes the balloon to rise.
Dihydrogen gas (H2) is highly flammable and poses a safety risk in balloons. The use of helium, which is non-flammable, is preferred in modern balloons to avoid the risk of fire accidents.
Balloons are usually filled with air. It is a colourless gas. There are other colourless gas options: helium, hydrogen, methane. Coloured gas options (chlorine, bromine) are generally reactive with the rubber or fabric used in balloon manufacture and are undatisfacoty as balloon fillers.