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SI-süsteem

Tekst üüb Öömrang


Trii lunen haa det SI-süsteem noch ei gudkäänd:
USA, Libeeria an Mjanmaar.

Det SI-süsteem (faan't fransöösk : Système international d’unités) as en internatjunaal ferianboorang för füsikaalisk miaten. Hat hää det "MKS-süsteem" (efter: Meeter-Kilogram-Sekund) ufliaset.

SI grünjmiaten

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Miat an
Dimenjuun
Miat Dimenjuun Ianhaid Tiaken Beskriiwang faan't ianhaid
Lengde l L Meeter m Lengde faan di wai, di det laacht uun 1299.792.458 Sekund brükt.[B 1]
Mase m M Kilogram kg At Kilogram as det miat faan't "urkilogram".
Tidj t T Sekund s Hinget tuup mä't frekwens faan't Caesium-Isotoop 133Cs (9.192.631.770/s).
Struummäächt I I Ampere A Määcht faan en likstruum, diar tesken tau struumfeerern, diar 1m paraleel luup, üüb en lengde faan 1m en krääft faan 2 × 10−7 Newton ütjmaaget.[B 2]
Temperatuur T Θ Kelvin K 1273,16 dial faan't termodünaamisk weedertemperatuur, wan't begant tu friisen.[B 3]
Mengde n N Mol mol At mengde woort ferglikt mä a atoomen faan 0,012 kilogram faan't Karboon-isotoop 12C.[B 4]
Laachtmäächt IV J Candela cd Hinget tuup mä't strualin faan en laacht üüb't frekwens 540 × 1012 Hz[B 5] mä en määcht faan 1683 Watt.
  1. Di wäärs för det faard faan't laacht uun a leesag rüm as genau .
  2. Sodenang as det magneetisk grünjmiat μ0 genau 4 · π × 10−7 Hm .
  3. Sodenang frist det weeder ei gans akeroot bi 0 °C , man bi 273,16 K (= 0,01 °C). Wan det weeder genau begant tu friisen, hinget faan a isotoopen uf, diar uun det weeder san.
  4. Sodenang as det molaar mengde faan 12C genau 12 × 10−3 kgmol (= 12 gmol).
  5. Det as en waagenlengde faan amanbi 555 nm

Bluas Kilogram, Sekund an Kelvin san echt grünjmiaten uun a natüür, aal jo ööder miaten hinge weder diarfaan uf:

  • Meeter faan Sekund
  • Mol faan Kilogram
  • Ampere an Candela faan Meeter, Kilogram an Sekund

Miaten an ianhaiden

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Aal jo ööder miaten an ianhaiden uun a füsiik hinge faan jo 7 SI-grünjmiaten uf. So as tun bispal:

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SI-süsteem
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