second

SI unit of time, defined as 9 192 631 770 periods of the ground-state hyperfine transitions of caesium-133
Intangible si_base_unit Q11574
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second

Summary

second is a SI base unit[1]. second draws 1,008 Wikipedia views per month (si_base_unit category, ranking #4 of 7).[2]

Key Facts

  • second's video is recorded as AnalogClockAnimation2 3hands 1h in realtime.gif[3].
  • second's video is recorded as Wie wird eine Sekunde mit Hilfe der Atomuhr definiert?.webm[4].
  • second's instance of is recorded as SI base unit[5].
  • second's instance of is recorded as unit of time[6].
  • second's instance of is recorded as UCUM base unit[7].
  • second's instance of is recorded as SI unit with special name[8].
  • second's measured physical quantity is recorded as duration[9].
  • second's measured physical quantity is recorded as specific impulse by weight[10].
  • second's measured physical quantity is recorded as half-life[11].
  • second's measured physical quantity is recorded as reactor time constant[12].
  • second's GND ID is recorded as 1188905376[13].
  • second's subclass of is recorded as time interval[14].
  • second's part of is recorded as minute[15].
  • second's part of is recorded as centimeter–gram–second system of units[16].
  • second's part of is recorded as MKS system of units[17].
  • second's Commons category is recorded as Second[18].
  • second's Freebase ID is recorded as /m/06nxt[19].
  • second's topic's main category is recorded as Category:Second[20].
  • second's Commons gallery is recorded as Second[21].
  • second's Art & Architecture Thesaurus ID is recorded as 300379239[22].
  • second's numeric value is recorded as {'unit': 'Q39369', 'amount': '+9192631770'}[23].
  • second's OmegaWiki Defined Meaning is recorded as 5947[24].
  • second's described by source is recorded as ISO 80000-3:2006 Quantities and units — Part 3: Space and time[25].
  • second's Encyclopædia Britannica Online ID is recorded as topic/SI-second[26].
  • second's short name is recorded as {'lang': 'nb', 'text': 'sek.'}[27].

Body

Works and Contributions

Things named for second include zeptosecond[28], an unit of time[29] and 60 Seconds! Reatomized[30], a video game[31].

Why It Matters

second draws 1,008 Wikipedia views per month (si_base_unit category, ranking #4 of 7).[2] second has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[32] second is known by 53 alternative names across languages and contexts.[33]

Entities named for second include zeptosecond[28], an unit of time[29] and 60 Seconds! Reatomized[30], a video game[31].

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] . ISO 80000-1:2009 Quantities and units—Part 1: General. wikidata.org.
  4. [6] . bipm.org. Retrieved . bipm.org. Provenance: wikidata.org.
  5. [7] . wikidata.org.
  6. [8] . wikidata.org.
  7. [9] . ISO 80000-1:2009 Quantities and units—Part 1: General. wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . wikidata.org.
  15. [17] . wikidata.org.
  16. [18] . wikidata.org.
  17. [19] . Freebase Data Dumps. wikidata.org.
  18. [20] . wikidata.org.
  19. [21] . wikidata.org.
  20. [22] . wikidata.org.
  21. [23] . bipm.org. Retrieved . bipm.org. Provenance: wikidata.org.
  22. [24] . wikidata.org.
  23. [25] . wikidata.org.
  24. [26] . wikidata.org.
  25. [27] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [28] . wikidata.org. → on this site
  2. [30] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [29] . Wikidata. wikidata.org. → on this site
  2. [31] . Wikidata. wikidata.org. → on this site

Class ancestry

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

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [32] . Wikidata sitelinks. wikidata.org.
  3. [33] . 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). second. Retrieved May 3, 2026, from https://4ort.xyz/entity/second
MLA “second.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/second.
BibTeX @misc{4ortxyz_second_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{second}}, year = {2026}, url = {https://4ort.xyz/entity/second}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): second — https://4ort.xyz/entity/second (retrieved 2026-05-03)

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