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| Uses of Hydrogen |
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 In many electrolysis reactions hydrogen is an important by-product. |
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Enormous quantities of hydrogen are used in the manufacture of ammonia and in the synthesis of methyl alcohol. |
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The hydrogenation of oils to produce edible fats, of coal to form synthetic petroleum, and of petroleum oils to enrich the petrol fraction requires large amounts of hydrogen. |
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The lightest in weight of all gases, hydrogen has been used for the inflation of balloons. |
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About 40% of the hydrogen produced industrially is used in the preparation of ammonia by the Haber process and hydrogen chloride gas. |
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Hydrogen is also used in high-temperature torches for cutting, melting, and welding metals. |
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