Knudsen number

quotient of the mean free path of a particle and a characteristic length
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Summary

Knudsen number ranks in the top 2% of general entities by monthly Wikipedia readership (204 views/month).[1]

Key Facts

  • Martin Knudsen is named after Knudsen number[2].
  • Knudsen number is a type of characteristic number[3].
  • Knudsen number is a type of dimensionless number in fluid mechanics[4].
  • Knudsen number is a type of criterion of similarity[5].
  • Knudsen number's described by source is recorded as ISO 80000-11:2019 Quantities and units — Part 11: Characteristic numbers[6].
  • Knudsen number's maintained by WikiProject is recorded as WikiProject Mathematics[7].
  • Knudsen number's recommended unit of measurement is recorded as 1[8].
  • Knudsen number's P14541 is recorded as jku7q[9].

Body

Definition and Type

Recorded subclass of include characteristic number[3], dimensionless number in fluid mechanics[4], and criterion of similarity[5].

Origins

Martin Knudsen is named after Knudsen number[2].

Why It Matters

Knudsen number ranks in the top 2% of general entities by monthly Wikipedia readership (204 views/month).[1] It has Wikipedia articles in 19 language editions, a strong signal of global cultural recognition.[10] It is known by 24 alternative names across languages and contexts.[11]

📑 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). Knudsen number. Retrieved October 15, 2026, from https://4ort.xyz/entity/knudsen-number
MLA “Knudsen number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 15 Oct. 2026, https://4ort.xyz/entity/knudsen-number.
BibTeX @misc{4ortxyz_knudsen-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Knudsen number}}, year = {2026}, url = {https://4ort.xyz/entity/knudsen-number}, note = {Accessed: 2026-10-15}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Knudsen number — https://4ort.xyz/entity/knudsen-number (retrieved 2026-10-15)

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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. 12d ago · C960657 · 2026-10-03 view diff on Wikidata ↗
    Lex id → Knudsen-tal
    Wikipedia languages → ['ar', 'bs', 'ca', 'commons', 'de', 'en', 'es', 'eu', 'fa', 'fr', 'he', 'hi', 'i
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Lex id: Knudsen-tal"
  2. 5w ago · عُثمان · 2026-09-10 view diff on Wikidata ↗
    Wurvoc.org measure id → Knudsen_number
    "/* wbsetclaim-create:1||1 */ Wurvoc.org measure id: Knudsen_number, Matched to [[:toollabs:mix-n-match/#/entry/14008345|Knudsen number (#14008345)]] in [[:toollabs:mix-n-match/#/catalog/281|Wurvoc.org"
  3. 13w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    P14541 → jku7q
    Encyclopedia of china (third edition) id → 110292, 227203
    Named after → —
    Recommended unit of measurement → 1
    + 6 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
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