Year

CoP

Boltzmann’s constant

Achieved relative uncertainty

Absolute uncertainty

Calculated comparative uncertainty*

Ref.

k・1023

rk・106

Δk・1029

εk'' = Δk/Sk

IARU

m2 kg/(s2 K)

m2 kg/(s2 K)

2011

LMТQ I

1.38065200

12.0

16.7

7.0430

[30]

2015

1.38065160

3.9

5.4

2.2700

[31]

2015

1.38064974

71.0

98.0

41.326

[32]

2017

1.38064974

2.7

3.7

1.5716

[33]

2017

1.38064300

5.0

6.9

2.9103

[34]

2017

1.38064360

10.0

14.1

5.9370

[35]