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femtosecond

one quadrillionth of a second
Intangible unit_of_time Q1777507

Facts

5 properties
Instance of
unit of time, SI derived unit[2]
Conversion to SI unit
+0.000000000000001[4]
Measured physical quantity
duration[3]
Unit symbol
fs, фс, fs, fs, fs[6][7]
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)[5]
🏷️ Also known as
en fs en femtosecond en 1 E-15 s ar عشرة مرفوعة للقوة 15 ar فمتوثانية ar فيمتو ثانية ar Femtosecond ar الفيمتو ثانية ar عشرة مرفوعة للقوة -15 de fs de Femtosekunde es femtosegundo fa فمتو ثانیه fa فمتوثانیه fi femtosekunti fr 1 E-15 s fr femtoseconde fr fs he פמטושנייה hu billiárdodmásodperc
🔖 Identifiers · 12
OpenAlex ID
C167735695
Freebase ID
/m/0kbjz
Great Norwegian Encyclopedia ID
femtosekund
Microsoft Academic ID (discontinued)
167735695
OmegaWiki Defined Meaning
380703
Ontology of units of Measure 2.0 unit ID
femtosecond-Time
Quora topic ID
Femtosecond
ScienceDirect topic ID
engineering/femtosecond
UCUM code
fs
Wolfram Language unit code
"Femtoseconds"
Wurvoc.org measure ID
femtosecond-time
Zhihu topic ID
20002334

Report an error or request removal Lineage (PROV-JSON)

🔗 Connections
Instance of 2
SI derived unit, unit of time
Named after 1
femtochemistry
Press Enter · cited answer in seconds

Summary

femtosecond is an unit of time[1].

Body

Influence

Things named for femtosecond include femtochemistry[8], a branch of chemistry[9].

Why It Matters

Entities named for femtosecond include femtochemistry[8], a branch of chemistry[9].

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] ↑ . Logopedia. wikidata.org.
  6. [7] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [8] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

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

Class ancestry

  1. [1] ↑ . Wikidata. 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 November 3, 2026, from https://4ort.xyz/entity/femtosecond
MLA “femtosecond.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 Nov. 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: 2026-11-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): femtosecond — https://4ort.xyz/entity/femtosecond (retrieved 2026-11-03)

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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. 4w 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"
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