Filling the balloon with helium and hydrogen can make the balloon float, but hydrogen is a combustible gas, which poses a safety hazard. Helium is safer. Helium is an inert gas, which is very safe and the inflation step is very simple. After buying the inflatable equipment, there are instructions in it. You can follow the instructions.

When the balloon flies to a certain height, it will explode. When the balloon rises in the air, the external air pressure changes with the increase of height. The higher the balloon flies, the thinner the air will be, the less the air density will be, and the more the gas density inside the balloon will be, so the balloon will slowly expand. When the balloon material cannot continue to expand, the balloon will explode and cannot continue to rise.

Chemical properties:

Helium is much less dense than air, and its chemical properties are very inactive. Compared with hydrogen, it is very safe because hydrogen can burn in the air and may cause an explosion. Helium is usually used to fill the air in spacecraft or advertising balloons. Helium is a colorless and odorless gas at normal temperature and pressure. Helium, as the substance with the lowest critical temperature found by human beings, appears dark yellow when discharged at low voltage.

When using helium, it is necessary to ensure that helium does not leak and the workplace is ventilated. When the oxygen content is lower than 19.5% due to the increase of helium content, the first contact person will have accelerated breathing and inattention. Bottled helium gas should be classified and stacked when transported, stored and used, and should not be close to open flames and heat sources.