Talk:Hydrogen

Critical Pressure Value

The article currently lists 1.28 MPa (12.8 bar) as the critical pressure of H2, but seems not to give a source. Smith, Van Ness, Abbot "Introduction to Chemical Engineering Thermydynamics" lists it as 13.13 bar, and it seems like NIST also lists 13.13 bar. I am going to change it to 1.313 MPa, but currently I don't understand why it was ever 1.28. — Preceding unsigned comment added by ~2026-52932-90 (talk) 22:23, 2 October 2026 (UTC)

1671 is not in the 18th century

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)

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

Applications: Hydrogenation: syngas contents error

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)

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

Is a application of deuterium an application of hydrogen?

I say, No, we should move that content to Deuterium. Johnjbarton (talk) 03:52, 15 September 2026 (UTC)

I agree. Or perhaps I'd say "pedantically yes and encyclopedically no". We have a separate article for the heavy isotope and it behaves differently enough from the light isotope to shunt such applications to the main article. Double sharp (talk) 18:32, 15 September 2026 (UTC)

I assume you mean to shunt deuterium applications to the Deuterium article? Johnjbarton (talk) 02:36, 16 September 2026 (UTC)

Yes. Double sharp (talk) 03:18, 16 September 2026 (UTC)