Lat upp høvuðsmeny

Broytingar

s
|-
|style="background:#F5F5F5" rowspan=3|'''[[sekund]]'''
|'''m<span style="font-size:88%">iðøld</span style>'''||{{sfrac|86&#8239;400}} av einum døgni.
|-
|'''1956'''||<!--{{sfrac|{{val|31556925.9747}}}} of the [[tropical year]] for 1900 January 0 at 12 hours [[ephemeris time]]. -->
|'''1881'''||<!-- A tenth of the electromagnetic CGS unit of current. The [CGS] electromagnetic unit of current is that current, flowing in an arc 1&nbsp;cm long of a circle 1&nbsp;cm in radius creates a field of one [[oersted]] at the centre. -->
|-
|'''1946'''||style="line-height: 12pt;11pt"|støddin á einum jøvnum streymi, sum, tá hann rennur í tveimum parallellum, óendaliga longum og óendaliga tunnum leiðarum í vakum og 1 m millum teirra, ger, at leiðararnir ávirka hvønn annan við 2&#8239;×&#8239;10<sup>−7</sup> N/m.
|-
|style="background:#F5F5F5" rowspan=3|'''[[kelvin]]'''
|-
|style="background:#F5F5F5" rowspan=2|'''[[candela]]'''
|'''1946'''||luminansurin frá einum likami við smeltitemperaturin hjá platin er 60 cd/cm<sup>2</sup>.
<!-- The value of the new candle is such that the brightness of the full radiator at the temperature of solidification of [[platinum]] is 60 new candles per square centimetre. -->
|-
|'''1979'''||style="line-height:5pt"|ljósstyrkin í ein rætning frá eini ljóskeldu, sum sendir út monokromatiskt ljós við frekvensinum 540&nbsp;THz og strálingsstyrkini {{sfrac|683}}&nbsp;W/sr í henda rætningin.<br>&nbsp;
|-
|}
2,686

rættingar