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SI osnovne jedinice.
SI osnovnih jedinica ima sedam: za duljinu, masu, vrijeme, jakost el. struje, temperaturu, količinu tvari i jakost (intenzitet) svjetlosti.
Osnovne SI jedinice
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Ime
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Simbol
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Veličina
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Definicija
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metar
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m
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duljina
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Jedan metar jednak je putu koji svjetlost prevali u vakuumu za 1/299 792 458 dio sekunde.
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kilogram
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kg
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masa
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Od 16. studenog 2018. definira se pomoću Planckove konstante, određene kao 6,62607015⋅10−34 J⋅s.
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sekunda
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s
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vrijeme
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Jedna sekunda je vrijeme 9 192 631 770 perioda zračenja atoma cezija 133 u osnovnom stanju.
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amper
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A
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električna struja
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Električna struja od 1 ampera je ona koja protičući kroz dva ravna paralelna vodiča beskonačne duljine i zanemarivog poprečnog presjeka, koji se nalaze na udaljenosti jednog metra u vakuumu, proizvodi silu među vodičima od 2·10−7 njutna po dužnom metru.
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kelvin
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K
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termodinamička temperatura
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Jedan kelvin jednak je 1/273,16 dijelu temperature trojne točke vode.
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Mol
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mol
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količina tvari
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Jedan mol je ona količina neke tvari koja sadrži NA=6,023·1023 svojih elementarnih čestica (atoma, iona, molekula). (vidi Avogadrova konstanta)
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kandela
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cd
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jakost svjetlosti
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Jedna kandela je ona svjetlosna jakost koju zrači površina crnog tijela od 1/600 000 kvadratnog metra na temperaturi od 2054 K i tlaku od 101 325 paskala.
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