Munurin millum rættingarnar hjá "Millumtjóða eindarskipanin"
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s corr using AWB |
Konstantarnir aftanfyri SI (umsett úr týsku wikiini) |
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==== SI og náttúrukonstantar ====
Síðani 20. mai 2019 eru allar tær 7 grundeindirnar (og harvið allar SI-eindir) defineraðar út frá 7 náttúrukonstantum. Tað hevur millum annað við sær, at hesir 7 konstantarnir hava '''eksakt''' tey virðini, sum standa í talvuni niðanfyri.
{| class="wikitable" style="background:#FDFDFD"
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! colspan=2| Konstantur
! Eksakt virði
! Síðani
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|style="text-align:center"|Δ''ν''<sub>Cs</sub>||Geislingarfrekvensur frá [[sesium|Cs]]-atomi||style="text-align:center"| 9 192 631 770 Hz||style="text-align:center"| 1967
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|style="text-align:center"|''c''<sub>0</sub>||Ljósferðin í tóma rúminum||style="text-align:center"|299 792 458 m/s||style= "text-align:center"| 1983
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|style="text-align:center"|''h''||Plancks konstantur||style="text-align:center"|6,626 070 15 × 10<sup>−34</sup> J·s||style="text-align:center"|2019
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|style="text-align:center"|''e''||Elementarløðingin||style="text-align:center"|1,602 176 634 × 10<sup>−19</sup> C||style="text-align:center"|2019
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|style="text-align:center"|''k''<sub>B</sub>||Boltzmanns konstantur||style="text-align:center"|1,380 649 × 10<sup>−23</sup> J/K||style="text-align:center"|2019
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|style="text-align:center"|''N''<sub>A</sub>||Avogadros konstantur||style="text-align:center"|6,022 140 76 × 10<sup>23</sup> mol<sup>−1</sup>||style="text-align:center"|2019
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|style="text-align:center"|''K''<sub>cd</sub>||Fotometriskur konstantur||style="text-align:center"|683 lm/W||style="text-align:center"| 1979
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=== Avleiddar eindir ===
Line 292 ⟶ 317:
| rúmd ||litur||L, l ||colspan=2 |1 L = 10<sup>-3</sup> m<sup>3</sup>
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| rowspan=2|massi/nøgd||unit, dalton||u, Da||colspan=2|1 u = 1 Da = 1,660
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|tons||t||colspan=2 |1 t = 10<sup>3</sup> kg
Line 300 ⟶ 325:
|millimetrar [[kyksilvur]] ||mmHg||colspan=2 |1 mmHg ≈ 133,322 Pa
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| elektrisk løðing ||elementarløðing||''e''||colspan=2 |''e'' = 1,602
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| rowspan=4 |lutfall||rowspan=2 |Bel ||rowspan=2 |B ||''L''<sub>F</sub> = 2 log</sub>({{sfrac|''F''|''F''<sub>0</sub>}}) B||rowspan=2 | 1 B = 10 dB = {{sfrac|ln(10)|2}} Np
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