At room temperature and pressure, hydrogen is a highly flammable, colorless, transparent and odorless gas. Hydrogen is the lowest density gas known in the world, and the density of hydrogen is only 1/14 of air.
Nowadays, the industry generally produces hydrogen gas from natural gas or water gas instead of adopting the method of electrolyzing water with high energy consumption. The hydrogen produced is used extensively for the cracking reactions in the petrochemical industry and the production of ammonia. Hydrogen molecules can enter the lattice of many metals causing "hydrogen embrittlement" which making hydrogen gas cylinder and tube require special materials.
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