-7 SI CONSTANTS-

-as of [9 APRIL 2024]–

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#1

c

“SPEED OF LIGHT”
(in ‘vacuum’)

(electro-magnetic radiation)

(links ‘space’ + ‘time’)

*299,792,458 meters per second*

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#2

h

“PLANCK’S CONSTANT”

“discrete energy ‘packets’*
(rather than a ‘spectrum’)

(measured in “joule seconds”)

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#3

e

“ELEMENTARY CHARGE”

(+1 proton / -1 electron)

(used to calculate the ‘coulomb’)

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#4

NA

“AVOGADRO CONSTANT”

(an ‘amount’)
(the ‘reciprocal’ of the ‘mole’)

the ‘mole’ being ‘6.022 140 76’ × 10²³

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#5

“BOLTZMANN CONSTANT”

(relates ‘energy’ to ‘temperature’)

*1.380 649 × 10−23 ‘joule’ per ‘kelvin’*

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#6

“THE CAESIUM STANDARD”

(used to define ‘time’)

(measured in ‘hertz’)
(‘cycles’ per ‘second’)

*the ‘ground state hyper-fine structure transition frequency’ of the caesium-133 atom Δν_Cs is exactly 9,192,631,770 hertz (Hz)*

(that’s ‘9 trillion’ +)

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#7

K_cd

*measures ‘brightness’*

*683 ‘lumens’ per ‘watt’*

*the luminous efficacy K_cd of mono-chromatic radiation of frequency 540×10¹² Hz (540 THz) – a frequency of green-colored light at approximately the ‘peak sensitivity’ of the ‘human eye’ – is exactly 683 lumens per watt (lm⋅W⁻¹)

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*🌈✨ *TABLE OF CONTENTS* ✨🌷*

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