2. How do ordinary balloons float?

3. How did the wedding balloon float?

4. How do birthday balloons float?

1. You can fill the balloon with hydrogen and helium to make it float.

2. The gas contained in the balloon blown out by the pump is mainly air, so there is no problem of poor quality between the balloon and the air, so it cannot float.

3. Theoretically, the balloon can float as long as it is filled with gas whose density is less than air.

4. For example, hydrogen and helium.

Hydrogen is often used as filling gas, but it is flammable, lively and prone to danger. Helium can also be used as filling gas. Helium is an inert gas, which is very safe.

6. Hydrogen: It is a highly combustible gas at normal temperature and pressure.

7. Colorless, transparent, odorless, tasteless and water-insoluble gas.

8. Hydrogen is the least dense gas known in the world. The density of hydrogen is only 114 of air, that is, at1standard atmospheric pressure and 0℃, the density of hydrogen is 0.089 g/L.

9. Therefore, hydrogen can be used as the filling gas for airships and hydrogen balloons.

10. Hydrogen is non-toxic and suffocating.

1 1. Hydrogen is flammable and explosive, so pure hydrogen is very dangerous.

12. If there is a strong knocking sound during combustion, it means that hydrogen is impure and prone to explosion, so we must pay enough attention to it.