Talk:Hydrogen

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Suggest adding this somewhere, unless already in a sub-article? "Hydrogen is an indirect greenhouse gas with a global warming potential (GWP) ~11x over 100 years, or ~30–40x over 20 years." RoyBoy 22:34, 20 April 2026 (UTC)Reply

Please post a source. Johnjbarton (talk) 23:23, 20 April 2026 (UTC)Reply

Came from Communications Earth & Environment, published June 2023 in Nature. Ranged results GWP100 (11.6 ± 2.8), GWP20 (37.3 ± 15.1) and GWP500 (3.31 ± 0.98). A Nov 2025 review provides bigger picture of uncertainty, but deemed June 2023 study "one of the most comprehensive analyses".

I did find mention in some sub-articles, but IMO applies here as atmospheric H2 has GWP regardless of source or use case. - RoyBoy 03:33, 23 April 2026 (UTC)Reply

I checked the source for the combustion enthalpy and the MJ/kg value given in the text is 141.9 MJ/kg but if you use the energy for a mole of hydrogen of -286kJ/mol and assume the number of moles in a kilogram is 496 then you get the value 141.856 rather than the given value of 141.865. So I believe the original author just made a small typo — Preceding unsigned comment added by Lazergurka (talk • contribs) 15:02, 30 April 2026 (UTC)Reply

@Lazergurka Please use the Add Topic or sign all posts.

I replaced the value to the one in the source. Thanks! Johnjbarton (talk) 16:01, 30 April 2026 (UTC)Reply

The history section begins with a subsection of the 18th century. Notably, the 1600s are not the 18th century (they are the 17th). Acephotino (talk) 17:19, 3 June 2026 (UTC)Reply

 Done Thank you for spotting this, I have moved it to a new 17th century subsection. Polyamorph (talk) 17:33, 3 June 2026 (UTC)Reply

Methanol is produced using "syngas" which is mixture of hydrogen and carbon MONoxide, which is explained in article referred to, while the paragraph states carbon DIoxide which is not a substrate in this reaction and it is not principal part of the mixture, rather a contamination Nieobecny (talk) 21:03, 31 July 2026 (UTC)Reply

Thanks fixed, added a source Johnjbarton (talk) 04:23, 1 August 2026 (UTC)Reply