Generally speaking, helium is safer, as it is an inert gas, but Hydrogen is cheaper to make and is lighter.
Helium is inert. Will not burn like hydrogen does so well.
Helium is inert whereas hydrogen is flammable and under some conditions explosive
Hydrogen is extremely flammable and helium is safer.
Modern spacecraft use helium instead of hydrogen because helium is not as flammable as hydrogen, making it a safer choice for various applications. Additionally, helium is chemically inert, so it does not react with other materials used in spacecraft systems, reducing the risk of explosions or fires. Helium also offers good lifting capabilities and is readily available.
Yes, because helium doesn't react, burn or explode.
The gas that helium replaced was Hydrogen
Because hydrogen is reactive and combines with oxygen, while helium is inert.
Heavier but safer. Look what happened to the Hindenburg:(
Helium is safer than hydrogen in hot air balloons because it is non-flammable. Hydrogen can ignite easily, posing a greater risk of fire. Additionally, helium is more stable and its lifting capacity is sufficient for use in hot air balloons.
Hydrogen balloons are more flammable and pose a higher safety risk compared to helium balloons, which are non-flammable. Helium balloons have better buoyancy and can lift heavier loads than hydrogen balloons. Helium is more readily available and safer to use compared to hydrogen, which is more difficult to obtain and handle safely.
Helium is much less dense than air, meaning it can provide lift. The only gas lighter than helium is hydrogen, which is too dangerous to use for such a purpose because it is extremely flammable. Helium, on the other hand is completely nonflammable. Aside from hydrogen no other gas is anywhere near as light as helium.
Hydrogen is the fuel used by the sun, helium is the waste produced by hydrogen use in the fusion process