When hydrogen and chlorine are mixed, when their ratio reaches 1: 1, it will explode even in direct sunlight, so hydrogen and helium can be filled, because both gases are lighter than air. At present, more helium is filled, because helium is an inert gas, which is safer.

Because hydrogen is cheaper than inert gases such as helium, hydrogen balloons are basically sold in the market. When hydrogen rubs against other objects to generate static electricity, it is easy to explode or burn when it meets an open flame. In addition, the balloons of colorful vendors sold in the market are mostly hydrogen balloons filled with hydrogen, and helium balloons filled with helium are safer.

Extended data:

Helium is an inert gas, so there is no danger in inflating balloons. The surface printing of these helium balloons not only looks very beautiful, but also can make aluminum balloons of various sizes, such as dinosaurs, Mickey, Donald Duck, dolphins, airplanes, tigers, elephants and so on. Once the product came out, it was deeply loved by people.

Aluminum balloons are suitable for many occasions, can be used as advertising balloons, and are the best gifts for advertising products of major enterprises and companies.

Hydrogen balloon explosion: 2065438+2007165438+1On the evening of October 27th, four young people in Nanjing saw the glowing "Internet celebrity balloons" and bought six taxis to leave. One of the men accidentally splashed sparks on the balloon while smoking, and six balloons exploded one after another, burning four young people. Two of the men were seriously injured, their faces were blackened, many blisters were burned on their hands, and their faces reached second-degree burns.

References:

Baidu encyclopedia-hydrogen balloon