dihydrogen

primary form in which hydrogen is found
ChemicalSubstance type_of_chemical_entity Q3027893
Press Enter · cited answer in seconds

dihydrogen

Summary

dihydrogen is a type of chemical entity[1]. dihydrogen ranks in the top 6% of type_of_chemical_entity entities by monthly Wikipedia readership (20 views/month).[2]

Key Facts

  • dihydrogen's instance of is recorded as type of chemical entity[3].
  • dihydrogen's instance of is recorded as simple substance[4].
  • dihydrogen's CAS Registry Number is recorded as 1333-74-0[5].
  • dihydrogen's EC number is recorded as 215-605-7[6].
  • dihydrogen's canonical SMILES is recorded as [H][H][7].
  • dihydrogen's InChI is recorded as InChI=1S/H2/h1H[8].
  • dihydrogen's InChIKey is recorded as UFHFLCQGNIYNRP-UHFFFAOYSA-N[9].
  • dihydrogen's chemical formula is recorded as H₂[10].
  • dihydrogen's subclass of is recorded as homonuclear diatomic molecule[11].
  • dihydrogen's part of is recorded as fermentative hydrogen production[12].
  • dihydrogen's part of is recorded as hydrogen metabolic process[13].
  • dihydrogen's part of is recorded as hydrogen biosynthetic process[14].
  • dihydrogen's part of is recorded as methane biosynthetic process from methanol and hydrogen[15].
  • dihydrogen's part of is recorded as hydrogenase (acceptor) activity[16].
  • dihydrogen's part of is recorded as hydrogen:quinone oxidoreductase activity[17].
  • dihydrogen's part of is recorded as N5,N10-methenyltetrahydromethanopterin hydrogenase activity[18].
  • dihydrogen's part of is recorded as hydrogen dehydrogenase activity[19].
  • dihydrogen's part of is recorded as coenzyme F420 hydrogenase activity[20].
  • dihydrogen's part of is recorded as hydrogen dehydrogenase (NADP+) activity[21].
  • dihydrogen's part of is recorded as Methanosarcina-phenazine hydrogenase activity[22].
  • dihydrogen's part of is recorded as hydrogenase activity (NAD+, ferredoxin)[23].
  • dihydrogen's part of is recorded as nitrogenase (flavodoxin) activity[24].
  • dihydrogen's part of is recorded as sulfur reductase activity[25].
  • dihydrogen's part of is recorded as nitrogenase activity[26].
  • dihydrogen's part of is recorded as cytochrome-c3 hydrogenase activity[27].

Why It Matters

dihydrogen ranks in the top 6% of type_of_chemical_entity entities by monthly Wikipedia readership (20 views/month).[2] dihydrogen has Wikipedia articles in 7 language editions, a strong signal of global cultural recognition.[28] dihydrogen is known by 57 alternative names across languages and contexts.[29]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] . wikidata.org.
  2. [4] . wikidata.org.
  3. [5] . Chemical Abstracts Service. Retrieved . wikidata.org.
  4. [6] . wikidata.org.
  5. [7] . wikidata.org.
  6. [8] . PubChem. wikidata.org.
  7. [9] . PubChem. wikidata.org.
  8. [10] . PubChem. wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . Gene Ontology release 2019-11-16. wikidata.org.
  11. [13] . Gene Ontology release 2019-11-16. wikidata.org.
  12. [14] . Gene Ontology release 2019-11-16. wikidata.org.
  13. [15] . Gene Ontology release 2019-11-16. wikidata.org.
  14. [16] . Gene Ontology release 2020-05-02. wikidata.org.
  15. [17] . Gene Ontology release 2020-05-02. wikidata.org.
  16. [18] . Gene Ontology release 2020-05-02. wikidata.org.
  17. [19] . Gene Ontology release 2020-05-02. wikidata.org.
  18. [20] . Gene Ontology release 2020-05-02. wikidata.org.
  19. [21] . Gene Ontology release 2020-05-02. wikidata.org.
  20. [22] . Gene Ontology release 2020-05-02. wikidata.org.
  21. [23] . Gene Ontology release 2020-05-02. wikidata.org.
  22. [24] . geneontology.org. Retrieved . geneontology.org. Provenance: wikidata.org.
  23. [25] . geneontology.org. Retrieved . geneontology.org. Provenance: wikidata.org.
  24. [26] . geneontology.org. Retrieved . geneontology.org. Provenance: wikidata.org.
  25. [27] . geneontology.org. Retrieved . geneontology.org. Provenance: wikidata.org.

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [28] . Wikidata sitelinks. wikidata.org.
  3. [29] . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). dihydrogen. Retrieved May 3, 2026, from https://4ort.xyz/entity/dihydrogen
MLA “dihydrogen.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/dihydrogen.
BibTeX @misc{4ortxyz_dihydrogen_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{dihydrogen}}, year = {2026}, url = {https://4ort.xyz/entity/dihydrogen}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): dihydrogen — https://4ort.xyz/entity/dihydrogen (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/dihydrogen · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 17d ago · Wostr · 2026-05-05 view diff on Wikidata ↗
    Combustion enthalpy {'unit': 'Q752197', 'amount': '-285.8'}
    Has use fuel gas, lifting gas
    Speed of sound {'unit': 'Q182429', 'amount': '+1101'}, {'unit': 'Q182429', 'amount': '+1310'}
    Safety classification and labelling NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response, Regulation (EC) No. 1272/2008
    + 18 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P4149]]: [[Q29004]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.