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mean lifetime

in nuclear physics, the reciprocal of the decay constant
Class type of: duration, scalar quantity Q1758559

Facts

11 properties
Subclass of
duration, scalar quantity[1][2]
Facet of
radionuclide, quantum particle[3][4]
Defining formula
\tau = \frac{1}{\lambda}
Described by source
ISO 80000-10:2019 Quantities and units — Part 10: Atomic and nuclear physics[5]
Different from
half-life, lifetime[7][8]
ISQ dimension
\mathsf{T}
In defining formula
\tau, \lambda
Main Wikidata property
P2645[6]
Maintained by WikiProject
WikiProject Mathematics[9]
Quantity symbol (LaTeX)
\tau
Recommended unit of measurement
second[10]
🏷️ Also known as
en lifetime en mean lifetime en mean life time en mean life en mean duration of life ar متوسط ​​العمر cs střední doba života da levetid de mittlere Lebensdauer de Lebensdauer el Μέσος χρόνος ζωής es vida media es vida mitad fr durée de vie moyenne fr vie moyenne he תוחלת אורך חיים he אורך חיים ממוצע he תוחלת חיים hu átlagos élettartam it vita media
🔖 Identifiers · 8
Elhuyar ZTH ID
007437
Google Knowledge Graph ID
/g/121k3h6r
Great Norwegian Encyclopedia ID
middelliv
IEV number
881-04-47, 395-01-13, 113-05-29
Lex ID
levetid_-_kvantemekanisk_begreb
QUDT dimension ID
A0E0L0I0M0H0T1D0
QUDT quantity kind ID
MeanLifetime
Wolfram Language quantity ID
Lifetime

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

🔗 Connections
Different from 1
half-life
Facet of 1
radionuclide
Maintained by WikiProject 1
WikiProject Mathematics
Recommended unit of measurement 1
second
Subclass of 1
scalar quantity
← Different from 1
half-life
Press Enter · cited answer in seconds

References

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

Direct Wikidata claims

  1. [1] ↑ . wikidata.org.
  2. [2] ↑ . wikidata.org.
  3. [3] ↑ . wikidata.org.
  4. [4] ↑ . wikidata.org.
  5. [5] ↑ . wikidata.org.
  6. [6] ↑ . wikidata.org.
  7. [7] ↑ . wikidata.org.
  8. [8] ↑ . wikidata.org.
  9. [9] ↑ . wikidata.org.
  10. [10] ↑ . 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). mean lifetime. Retrieved November 11, 2026, from https://4ort.xyz/entity/mean-lifetime
MLA “mean lifetime.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Nov. 2026, https://4ort.xyz/entity/mean-lifetime.
BibTeX @misc{4ortxyz_mean-lifetime_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{mean lifetime}}, year = {2026}, url = {https://4ort.xyz/entity/mean-lifetime}, note = {Accessed: 2026-11-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): mean lifetime — https://4ort.xyz/entity/mean-lifetime (retrieved 2026-11-11)

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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. 8w ago · عُثمان · 2026-09-10 view diff on Wikidata ↗
    Recommended unit of measurement → second
    Main Wikidata property → P2645
    Maintained by WikiProject → WikiProject Mathematics
    Different from → half-life, lifetime
    + 4 other properties edited (see Wikidata diff for full list)
    "Created claim: IEV number: 113-05-29, Matched to mean life (#102055366) in IEC 60050 #mix'n'm"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.