Helium is good, hydrogen is too dangerous and easy to explode. Hydrogen is the least dense gas known in the world at present, and its chemical properties are relatively active. It will burn or even explode in case of open fire or high temperature. As the first generation filler, hydrogen has been used on large airships, causing heavy casualties. Helium is 78% denser than air and can float even if it is lighter than air.

Moreover, helium is an inert gas with relatively stable chemical properties, and it is a safe gas to replace hydrogen. Chen Feng, director of the outpatient internal medicine department of Xi 'an Children's Hospital, said that they had not received any cases of injuries caused by online celebrity balloons recently. However, he reminded people to buy this kind of celebrity balloon carefully, because the balloon filled with hydrogen is more powerful when it is heated and burst, which will instantly cause burns and scalds.

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Balloons filled with hydrogen must not touch open flames or cigarette butts, because once there is a flame, it is easy to burn and explode. If there is filler in it, the filler and wire will cause secondary harm to human body after burning and explosion.

The explosion of a balloon filled with air is a physical explosion. When you meet an open flame, you just make a "poof" and it won't burn. So remind parents and friends not to buy balloons filled with hydrogen. Comparatively speaking, balloons filled with air are safer.

People's Daily Online-How powerful is the online celebrity balloon? Hydrogen will burn and explode when it meets fire.