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Almost everywhere: e.g. water is made of oxygen and hydrogen; all hydrocarbons (petrol, oil, plastics) contain hydrogen; thus the name.

If you mean free hydrogen, then it is in v. smal quantities in the atmosphere, but as its volatile the quantities would be miniscule, if there at all, or in cylinders filled by a hydrogen filling plant.

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13y ago

What else can I help you with?