Hartmann number

characteristic number for electrically conducting fluids
Thing general Q1587280
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Hartmann number

Summary

Hartmann number ranks in the top 2% of general entities by monthly Wikipedia readership (13 views/month).[1]

Key Facts

  • Julius Hartmann is named after Hartmann number[2].
  • Hartmann number's subclass of is recorded as dimensionless number in fluid mechanics[3].
  • Hartmann number's subclass of is recorded as criterion of similarity[4].
  • Hartmann number's subclass of is recorded as characteristic number[5].
  • Hartmann number's Freebase ID is recorded as /m/09g9xhf[6].
  • Hartmann number's described by source is recorded as ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers[7].
  • Hartmann number's defining formula is recorded as \mathit{Ha} = B l \sqrt{\frac{\sigma}{\eta}}[8].
  • Hartmann number's studied by is recorded as magnetohydrodynamics[9].
  • Hartmann number's ISQ dimension is recorded as 1[10].
  • Hartmann number's maintained by WikiProject is recorded as WikiProject Mathematics[11].
  • Hartmann number's maintained by WikiProject is recorded as WikiProject Fluid dynamics[12].
  • Hartmann number's Microsoft Academic ID is recorded as 2777869274[13].
  • Hartmann number's in defining formula is recorded as \mathit{Ha}[14].
  • Hartmann number's in defining formula is recorded as B[15].
  • Hartmann number's in defining formula is recorded as l[16].
  • Hartmann number's in defining formula is recorded as \sigma[17].
  • Hartmann number's in defining formula is recorded as \eta[18].
  • Hartmann number's Wolfram Language quantity ID is recorded as HartmannNumber[19].
  • Hartmann number's quantity symbol is recorded as \mathit{Ha}[20].
  • Hartmann number's recommended unit of measurement is recorded as 1[21].
  • Hartmann number's OpenAlex ID is recorded as C2777869274[22].
  • Hartmann number's Encyclopedia of China is recorded as 136682[23].

Why It Matters

Hartmann number ranks in the top 2% of general entities by monthly Wikipedia readership (13 views/month).[1] It has Wikipedia articles in 13 language editions, a strong signal of global cultural recognition.[24]

References

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

Direct Wikidata claims

  1. [2] . wikidata.org.
  2. [3] . wikidata.org.
  3. [4] . wikidata.org.
  4. [5] . wikidata.org.
  5. [6] . Freebase Data Dumps. wikidata.org.
  6. [7] . wikidata.org.
  7. [8] . ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers. wikidata.org.
  8. [9] . wikidata.org.
  9. [10] . wikidata.org.
  10. [11] . wikidata.org.
  11. [12] . wikidata.org.
  12. [13] . wikidata.org.
  13. [14] . wikidata.org.
  14. [15] . wikidata.org.
  15. [16] . wikidata.org.
  16. [17] . wikidata.org.
  17. [18] . wikidata.org.
  18. [19] . wikidata.org.
  19. [20] . ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers. wikidata.org.
  20. [21] . ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers. wikidata.org.
  21. [22] . OpenAlex. Retrieved . docs.openalex.org. Provenance: wikidata.org.
  22. [23] . wikidata.org.

Aggregate / graph-position facts

  1. [1] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [24] . Wikidata sitelinks. 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). Hartmann number. Retrieved April 11, 2026, from https://4ort.xyz/entity/hartmann-number
MLA “Hartmann number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Apr. 2026, https://4ort.xyz/entity/hartmann-number.
BibTeX @misc{4ortxyz_hartmann-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Hartmann number}}, year = {2026}, url = {https://4ort.xyz/entity/hartmann-number}, note = {Accessed: 2026-04-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Hartmann number — https://4ort.xyz/entity/hartmann-number (retrieved 2026-04-11)

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