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femtosecond

one quadrillionth of a second
Intangible unit_of_time Q1777507
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Summary

femtosecond is an unit of time[1]. femtosecond draws 924 Wikipedia views per month (unit of time category, ranking #36 of 82).[2]

Key Facts

  • Instance of: SI derived unit[3]
  • Measured physical quantity: duration[4]
  • Conversion to SI unit: 0.000000000000001 seconds[5]
  • Wikidata SPARQL query equivalent: wd:Q1777507 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)[6]
  • Unit symbol: fs[7], фс[8]

Body

Influence

Things named for femtosecond include femtochemistry[9], a branch of chemistry[10].

Why It Matters

femtosecond has Wikipedia articles in 16 language editions, a strong signal of global cultural recognition.[11] femtosecond is known by 38 alternative names across languages and contexts.[12]

Entities named for femtosecond include femtochemistry[9], a branch of chemistry[10].

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] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . Logopedia. wikidata.org.
  6. [8] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [9] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [10] ↑ . 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. [11] ↑ . Wikidata sitelinks. wikidata.org.
  3. [12] ↑ . 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). femtosecond. Retrieved October 11, 2026, from https://4ort.xyz/entity/femtosecond
MLA “femtosecond.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Oct. 2026, https://4ort.xyz/entity/femtosecond.
BibTeX @misc{4ortxyz_femtosecond_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{femtosecond}}, year = {2026}, url = {https://4ort.xyz/entity/femtosecond}, note = {Accessed: 2026-10-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): femtosecond — https://4ort.xyz/entity/femtosecond (retrieved 2026-10-11)

Canonical URL: https://4ort.xyz/entity/femtosecond · 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. 5d ago · MsynBot bot · 2026-10-06 view diff on Wikidata ↗
    Sitelink count → 26
    Instance of → unit of time, SI derived unit
    Conversion to si unit → {'unit': 'Q11574', 'amount': '+0.000000000000001'}
    Wikipedia languages → ['ar', 'arz', 'ast', 'ca', 'de', 'en', 'es', 'eu', 'fa', 'fr', 'gl', 'hak', 'id'
    + 3 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ remove badge sitelink to redirect from ukwiki sitelink; sitelink points to a non-redirect page #msynbotTask10"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.