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SI defining constants

Name the exact values of constants that define the base units of International System of Units (SI).
Source: Wikipedia
If there are two boxes, answer in scientific notation. Otherwise, answer the full decimal value.
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OtterSou
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Last updated: August 18, 2024
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First submittedAugust 11, 2024
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const
description
value
unit
ΔvCs
hyperfine transition
frequency of Cs-133
9
1
9
2
6
3
1
7
7
0
 
Hz
c
speed of light in vacuum
 
2
9
9
7
9
2
4
5
8
 
m/s
h
Planck constant
6.
6
2
6
0
7
0
1
5
 
×10-34
J·s
e
elementary charge
1.
6
0
2
1
7
6
1
3
4
×10-19
C
k
Boltzmann constant
1.
3
8
0
6
4
9
 
 
 
×10-23
J/K
NA
Avogadro constant
6.
0
2
2
1
4
0
7
6
 
×1023
mol-1
Kcd
luminous efficacy of
540 THz radiation
 
 
 
 
 
 
 
6
8
3
 
lm/W
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