et

sekund

1 substantive

Terminological databases

Metroloogia terminibaas

ID 574082 Last modified 13.09.2026
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Domain metrologyunits of measurement
sekund preferred
nurgasekund
kaaresekund
''
second preferred
arcsecond
angular second
second of arc
''
  • tasanurga SI väline ühik
  • non-SI unit for plane angle
sekund preferred
Usage examples
  • Sekund ehk nurgasekund või kaaresekund on tasanurga mõõtühik, mis on kasutusel väga väikeste nurkade mõõtmiseks, ja on kasutatav koos SI ühikutega.
nurgasekund
kaaresekund
'' symbol
Usage examples
  • 1'' = (1/60)' = (π/648 000) rad.
second preferred
Usage examples
  • A second (also called an arcsecond or second of arc) is a tiny unit used to measure very small angles, and is the non-SI unit accepted for use with the SI.
arcsecond
angular second
second of arc
'' symbol
Usage examples
  • 1'' = (1/60)' = (π/648 000) rad.

Metroloogia terminibaas

ID 572525 Last modified 13.09.2026
View dataset
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Domain metrologyunits of measurement
sekund
s
second
s
  • sekund on määratud sõltuvalt tseesiumi sageduse ∆νCs, milleks on tseesiumi aatomi isotoobi 133 kahe häirimata põhiseisundi struktuurinivoo vahelisele üleminekule vastav sagedus, fikseerimisega väärtusarvul 9 192 631 770 väljendatud ühiku Hz abil, mis on võrdne ühikuga s–1
    Good to know
    • Sekund (tähis s) on SI ajaühik, ühtlasi ka SI põhiühik.
  • the second defined by taking the fixed numerical value of the caesium frequency ∆νCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1
    Good to know
    • The second, symbol s, is the SI unit of time, and the unit of proper time in the sense of the general theory of relativity, and the base unit of the SI.
sekund
Usage examples
  • Sekund on ajaühik, mis tavaliselt tuletatakse ööpäeva jagamisest esmalt 24 tunniks, seejärel 60 minutiks ja lõpuks 60 sekundiks, kokku 24 × 60 × 60 = 86400 sekundit ööpäevas.
Good to know
  • Põhiühik sekund on defineeritud SI Brošüüris, mis on publitseeritud BIPM-i poolt.
s symbol
second
Usage examples
  • The second is a unit of time derived from the division of the day, first into 24 hours, then into 60 minutes, and lastly into 60 seconds, for a total of 24 × 60 × 60 = 86400 seconds per day.
Good to know
  • The second is defined by the SI Brochure, which is published by the BIPM.
s symbol

Word forms

Inflection Type 2e

sekund sekundid
sekundi sekundite
sekundit sekundeid

Etymology

laensõna
  • sekund
    • Sekunde 'sekund'
      • secunda 'teine' keskladina väljendist pars minuta secunda 'teine vähendatud osa'

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