You can use air but it won't float so I would recommend helium. If you suck in helium, it will make your voice sound weird.... Try it!!
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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.
Helium is used in balloons instead of hydrogen because it is non-flammable. Hydrogen is flammable and can be dangerous, while helium is inert and poses less of a fire risk. Additionally, helium is less dense than air, providing better lift for balloons.
Helium is a non-flammable and lighter-than-air gas, making it safe and efficient for filling balloons. Oxygen is combustible and could create a fire hazard, while hydrogen is highly flammable and poses a risk of explosion. Helium offers the best combination of safety and buoyancy for balloon use.
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Liquid helium is used to cool the superconducting electromagnets.