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si defining constants
symbol        defining constant        exact value
¦¤¦Ícs        hyperfine transition frequency of 133cs        9192631770 hz
c        speed of light        299792458 m/s
h        planck constant        6.62607015¡Á10−34 j⋅s
e        elementary charge        1.602176634¡Á10−19 c
k        boltzmann constant        1.380649¡Á10−23 j/k
na        avogadro constant        6.02214076¡Á1023 mol−1
kcd        luminous efficacy of 540 thz radiation        683 lm/w
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