Gas Introduction
Hydrogen is a simple substance formed from the element hydrogen, with the chemical formula H2 and a molecular weight of 2.01588. Hydrogen gas at room temperature and pressure is a colorless, odorless, highly flammable, and insoluble gas in water. The density of hydrogen is 0.089g/L (101.325kpa, 0 ° C), which is only 1/14 of that of air, making it the least dense gas known in the world. So hydrogen can be used as a filling gas for airships and hydrogen balloons (due to its flammability and low safety, helium is often used to fill airships). Hydrogen reacts with non metals with high electronegativity to exhibit reducibility, and reacts with active metals to exhibit oxidizability.
Hydrogen is extremely flammable and has the risk of explosion when mixed with fluorine, chlorine, oxygen, carbon monoxide, and air. Among them, the mixture of hydrogen and fluorine can spontaneously explode in low temperature and dark environments, and when mixed with chlorine at a volume ratio of 1:1, it can also explode under light. Hydrogen gas, due to its colorless and odorless nature, has a transparent flame during combustion, making its presence difficult to detect by the senses. In many cases, odorous ethanethiol is added to hydrogen gas to enhance olfactory perception and give color to the flame. Gas is lighter than air, and when used and stored indoors, leaks can rise and accumulate on the roof, making it difficult to discharge. When exposed to a fire source, it can cause an explosion.

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