Hydrogen with the chemical formula ?H2? is a colourless, odourless, flammable substance chemical element. Hydrogen is the most abundant element in the world and accounted for 0.14% of the earth?s crust by weight. Hydrogen is three times abundant as helium, which is also widely available in nature. Hydrogen has a wide range of benefits such as being cost-effective, efficient, and environmentally friendly, as a result, hydrogen usage grows in the refining of petroleum, the treatment of metals, the production of fertilisers, and the processing of food goods.
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