Year

CoP

Boltzmann’s constant

Achieved relative uncertainty

Absolute uncertainty

k_b possible interval of placing*

Calculated comparative uncertainty

Calculated comparative uncertainty

Ref.

k・10²³

r_k・10⁶

Δ_k・10²⁹

u_k・10²⁹

ε_k' = Δ_k/u_k

IACU

ε_k'' = Δ_k/S_k

IARU

m² kg/(s² K)

m² kg/ (s² K)

m² kg/ (s² K)

2012

LMТQ I

1.38066509

7.9

1.09

6.7

1.6279

4.5983

[24]

2013

1.38066509

4.3

5.94

1.2

4.9473

2.5029

[25]

2015

1.38066509

4.0

5.52

11.0

0.5020

2.3282

[26]

2017

1.3806482

1.9

2.62

5.2

0.5044

1.1059

[27]

2018

1.38064904

0.37

0.51

1.0

0.5184

0.2154

[21]

2018

1.3806490

0.37

0.51

1.0

0.5184

0.2154

[28]