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How do you go from hydrogen gas to water and vice versa?

Answer:

To generate H2 from H2O:

Electrolysis -- by applying a voltage to water, oxygen and hydrogen gas are generated.


To make H2O from H2 and O2:

Combustion -- burning hydrogen gas in oxygen results in pure water and heat!
Fuel Cell -- H2 and O2 are combined to produce electricity and water in exactly the reverse reaction of electrolysis.

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First answer by ID1168015177. Last edit by JEK. Contributor trust: 2959 [recommend contributor recommended]. Question popularity: 20 [recommend question].

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