H2 gas combustion is silent, and will produce a blue flame. H2 gas is a very useful fuel. In the gas contains more than 50 percent hydrogen. The high temperatures generated by the combustion of H2 gas are sufficient to melt the metal. H2 gas commonly used in industry to cut or weld metal. H2 gas burns in the air and actually reacts with the oxygen in the air to produce water. There is a lot of heat released during this reaction, which is three times that of gasoline under the same conditions. Therefore, H2 gas can be used as high-energy fuel, used on rockets. China's Long March 3 rocket liquid hydrogen fuel.
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